mirror of https://github.com/postgres/postgres
Avoid retrieving dummy NULL columns in postgres_fdw.
This should provide some marginal overall savings, since it surely takes many more cycles for the remote server to deal with the NULL columns than it takes for postgres_fdw not to emit them. But really the reason is to keep the emitted queries from looking quite so silly ...
This commit is contained in:
Tom Lane
parent
9cbc4b80dd
commit
e690b95150
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@ -106,10 +106,12 @@ static void deparseTargetList(StringInfo buf,
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PlannerInfo *root,
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Index rtindex,
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Relation rel,
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Bitmapset *attrs_used);
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Bitmapset *attrs_used,
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List **retrieved_attrs);
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static void deparseReturningList(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *returningList);
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List *returningList,
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List **retrieved_attrs);
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static void deparseColumnRef(StringInfo buf, int varno, int varattno,
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PlannerInfo *root);
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static void deparseRelation(StringInfo buf, Relation rel);
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@ -652,12 +654,16 @@ is_builtin(Oid oid)
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* Construct a simple SELECT statement that retrieves desired columns
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* of the specified foreign table, and append it to "buf". The output
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* contains just "SELECT ... FROM tablename".
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*
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* We also create an integer List of the columns being retrieved, which is
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* returned to *retrieved_attrs.
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*/
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void
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deparseSelectSql(StringInfo buf,
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PlannerInfo *root,
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RelOptInfo *baserel,
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Bitmapset *attrs_used)
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Bitmapset *attrs_used,
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List **retrieved_attrs)
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{
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RangeTblEntry *rte = planner_rt_fetch(baserel->relid, root);
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Relation rel;
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@ -672,7 +678,8 @@ deparseSelectSql(StringInfo buf,
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* Construct SELECT list
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*/
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appendStringInfoString(buf, "SELECT ");
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deparseTargetList(buf, root, baserel->relid, rel, attrs_used);
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deparseTargetList(buf, root, baserel->relid, rel, attrs_used,
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retrieved_attrs);
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/*
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* Construct FROM clause
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@ -687,24 +694,24 @@ deparseSelectSql(StringInfo buf,
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* Emit a target list that retrieves the columns specified in attrs_used.
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* This is used for both SELECT and RETURNING targetlists.
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*
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* We list attributes in order of the foreign table's columns, but replace
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* any attributes that need not be fetched with NULL constants. (We can't
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* just omit such attributes, or we'll lose track of which columns are
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* which at runtime.) Note however that any dropped columns are ignored.
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* Also, if ctid needs to be retrieved, it's added at the end.
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* The tlist text is appended to buf, and we also create an integer List
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* of the columns being retrieved, which is returned to *retrieved_attrs.
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*/
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static void
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deparseTargetList(StringInfo buf,
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PlannerInfo *root,
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Index rtindex,
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Relation rel,
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Bitmapset *attrs_used)
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Bitmapset *attrs_used,
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List **retrieved_attrs)
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{
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TupleDesc tupdesc = RelationGetDescr(rel);
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bool have_wholerow;
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bool first;
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int i;
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*retrieved_attrs = NIL;
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/* If there's a whole-row reference, we'll need all the columns. */
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have_wholerow = bms_is_member(0 - FirstLowInvalidHeapAttributeNumber,
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attrs_used);
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@ -718,16 +725,18 @@ deparseTargetList(StringInfo buf,
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if (attr->attisdropped)
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continue;
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if (!first)
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appendStringInfoString(buf, ", ");
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first = false;
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if (have_wholerow ||
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bms_is_member(i - FirstLowInvalidHeapAttributeNumber,
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attrs_used))
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{
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if (!first)
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appendStringInfoString(buf, ", ");
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first = false;
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deparseColumnRef(buf, rtindex, i, root);
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else
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appendStringInfoString(buf, "NULL");
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*retrieved_attrs = lappend_int(*retrieved_attrs, i);
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}
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}
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/*
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@ -742,6 +751,9 @@ deparseTargetList(StringInfo buf,
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first = false;
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appendStringInfoString(buf, "ctid");
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*retrieved_attrs = lappend_int(*retrieved_attrs,
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SelfItemPointerAttributeNumber);
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}
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/* Don't generate bad syntax if no undropped columns */
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@ -809,11 +821,16 @@ appendWhereClause(StringInfo buf,
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/*
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* deparse remote INSERT statement
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*
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* The statement text is appended to buf, and we also create an integer List
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* of the columns being retrieved by RETURNING (if any), which is returned
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* to *retrieved_attrs.
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*/
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void
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deparseInsertSql(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *targetAttrs, List *returningList)
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List *targetAttrs, List *returningList,
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List **retrieved_attrs)
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{
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AttrNumber pindex;
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bool first;
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@ -858,16 +875,24 @@ deparseInsertSql(StringInfo buf, PlannerInfo *root,
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appendStringInfoString(buf, " DEFAULT VALUES");
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if (returningList)
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deparseReturningList(buf, root, rtindex, rel, returningList);
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deparseReturningList(buf, root, rtindex, rel, returningList,
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retrieved_attrs);
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else
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*retrieved_attrs = NIL;
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}
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/*
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* deparse remote UPDATE statement
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*
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* The statement text is appended to buf, and we also create an integer List
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* of the columns being retrieved by RETURNING (if any), which is returned
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* to *retrieved_attrs.
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*/
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void
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deparseUpdateSql(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *targetAttrs, List *returningList)
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List *targetAttrs, List *returningList,
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List **retrieved_attrs)
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{
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AttrNumber pindex;
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bool first;
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@ -894,23 +919,34 @@ deparseUpdateSql(StringInfo buf, PlannerInfo *root,
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appendStringInfoString(buf, " WHERE ctid = $1");
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if (returningList)
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deparseReturningList(buf, root, rtindex, rel, returningList);
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deparseReturningList(buf, root, rtindex, rel, returningList,
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retrieved_attrs);
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else
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*retrieved_attrs = NIL;
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}
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/*
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* deparse remote DELETE statement
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*
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* The statement text is appended to buf, and we also create an integer List
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* of the columns being retrieved by RETURNING (if any), which is returned
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* to *retrieved_attrs.
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*/
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void
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deparseDeleteSql(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *returningList)
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List *returningList,
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List **retrieved_attrs)
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{
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appendStringInfoString(buf, "DELETE FROM ");
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deparseRelation(buf, rel);
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appendStringInfoString(buf, " WHERE ctid = $1");
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if (returningList)
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deparseReturningList(buf, root, rtindex, rel, returningList);
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deparseReturningList(buf, root, rtindex, rel, returningList,
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retrieved_attrs);
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else
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*retrieved_attrs = NIL;
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}
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/*
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@ -919,7 +955,8 @@ deparseDeleteSql(StringInfo buf, PlannerInfo *root,
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static void
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deparseReturningList(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *returningList)
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List *returningList,
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List **retrieved_attrs)
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{
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Bitmapset *attrs_used;
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@ -931,7 +968,8 @@ deparseReturningList(StringInfo buf, PlannerInfo *root,
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&attrs_used);
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appendStringInfoString(buf, " RETURNING ");
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deparseTargetList(buf, root, rtindex, rel, attrs_used);
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deparseTargetList(buf, root, rtindex, rel, attrs_used,
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retrieved_attrs);
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}
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/*
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@ -959,10 +997,11 @@ deparseAnalyzeSizeSql(StringInfo buf, Relation rel)
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/*
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* Construct SELECT statement to acquire sample rows of given relation.
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*
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* Note: command is appended to whatever might be in buf already.
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* SELECT command is appended to buf, and list of columns retrieved
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* is returned to *retrieved_attrs.
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*/
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void
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deparseAnalyzeSql(StringInfo buf, Relation rel)
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deparseAnalyzeSql(StringInfo buf, Relation rel, List **retrieved_attrs)
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{
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Oid relid = RelationGetRelid(rel);
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TupleDesc tupdesc = RelationGetDescr(rel);
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@ -972,6 +1011,8 @@ deparseAnalyzeSql(StringInfo buf, Relation rel)
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ListCell *lc;
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bool first = true;
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*retrieved_attrs = NIL;
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appendStringInfoString(buf, "SELECT ");
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for (i = 0; i < tupdesc->natts; i++)
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{
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@ -999,6 +1040,8 @@ deparseAnalyzeSql(StringInfo buf, Relation rel)
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}
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appendStringInfoString(buf, quote_identifier(colname));
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*retrieved_attrs = lappend_int(*retrieved_attrs, i + 1);
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}
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/* Don't generate bad syntax for zero-column relation. */
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@ -473,16 +473,16 @@ SELECT * FROM ft2 a, ft2 b WHERE a.c1 = 47 AND b.c1 = a.c2;
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-- simple join
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PREPARE st1(int, int) AS SELECT t1.c3, t2.c3 FROM ft1 t1, ft2 t2 WHERE t1.c1 = $1 AND t2.c1 = $2;
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EXPLAIN (VERBOSE, COSTS false) EXECUTE st1(1, 2);
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------
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QUERY PLAN
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--------------------------------------------------------------------
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Nested Loop
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Output: t1.c3, t2.c3
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-> Foreign Scan on public.ft1 t1
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Output: t1.c3
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Remote SQL: SELECT NULL, NULL, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" = 1))
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Remote SQL: SELECT c3 FROM "S 1"."T 1" WHERE (("C 1" = 1))
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-> Foreign Scan on public.ft2 t2
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Output: t2.c3
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Remote SQL: SELECT NULL, NULL, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" = 2))
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Remote SQL: SELECT c3 FROM "S 1"."T 1" WHERE (("C 1" = 2))
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(8 rows)
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EXECUTE st1(1, 1);
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@ -500,8 +500,8 @@ EXECUTE st1(101, 101);
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-- subquery using stable function (can't be sent to remote)
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PREPARE st2(int) AS SELECT * FROM ft1 t1 WHERE t1.c1 < $2 AND t1.c3 IN (SELECT c3 FROM ft2 t2 WHERE c1 > $1 AND date(c4) = '1970-01-17'::date) ORDER BY c1;
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EXPLAIN (VERBOSE, COSTS false) EXECUTE st2(10, 20);
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QUERY PLAN
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-------------------------------------------------------------------------------------------------------------------------
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QUERY PLAN
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----------------------------------------------------------------------------------------------------------
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Sort
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Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
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Sort Key: t1.c1
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@ -516,7 +516,7 @@ EXPLAIN (VERBOSE, COSTS false) EXECUTE st2(10, 20);
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-> Foreign Scan on public.ft2 t2
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Output: t2.c3
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Filter: (date(t2.c4) = '01-17-1970'::date)
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Remote SQL: SELECT NULL, NULL, c3, c4, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" > 10))
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Remote SQL: SELECT c3, c4 FROM "S 1"."T 1" WHERE (("C 1" > 10))
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(15 rows)
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EXECUTE st2(10, 20);
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@ -534,8 +534,8 @@ EXECUTE st2(101, 121);
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-- subquery using immutable function (can be sent to remote)
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PREPARE st3(int) AS SELECT * FROM ft1 t1 WHERE t1.c1 < $2 AND t1.c3 IN (SELECT c3 FROM ft2 t2 WHERE c1 > $1 AND date(c5) = '1970-01-17'::date) ORDER BY c1;
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EXPLAIN (VERBOSE, COSTS false) EXECUTE st3(10, 20);
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QUERY PLAN
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-----------------------------------------------------------------------------------------------------------------------------------------------------------------
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QUERY PLAN
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-----------------------------------------------------------------------------------------------------------------------
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Sort
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Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
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Sort Key: t1.c1
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@ -549,7 +549,7 @@ EXPLAIN (VERBOSE, COSTS false) EXECUTE st3(10, 20);
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Output: t2.c3
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-> Foreign Scan on public.ft2 t2
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Output: t2.c3
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Remote SQL: SELECT NULL, NULL, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" > 10)) AND ((date(c5) = '1970-01-17'::date))
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Remote SQL: SELECT c3 FROM "S 1"."T 1" WHERE (("C 1" > 10)) AND ((date(c5) = '1970-01-17'::date))
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(14 rows)
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EXECUTE st3(10, 20);
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@ -834,7 +834,7 @@ INSERT INTO ft2 (c1,c2,c3) SELECT c1+1000,c2+100, c3 || c3 FROM ft2 LIMIT 20;
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Output: ((ft2_1.c1 + 1000)), ((ft2_1.c2 + 100)), ((ft2_1.c3 || ft2_1.c3))
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-> Foreign Scan on public.ft2 ft2_1
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Output: (ft2_1.c1 + 1000), (ft2_1.c2 + 100), (ft2_1.c3 || ft2_1.c3)
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Remote SQL: SELECT "C 1", c2, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1"
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Remote SQL: SELECT "C 1", c2, c3 FROM "S 1"."T 1"
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(9 rows)
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INSERT INTO ft2 (c1,c2,c3) SELECT c1+1000,c2+100, c3 || c3 FROM ft2 LIMIT 20;
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@ -968,7 +968,7 @@ UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
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Hash Cond: (ft2.c2 = ft1.c1)
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-> Foreign Scan on public.ft2
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Output: ft2.c1, ft2.c2, ft2.c3, ft2.c4, ft2.c5, ft2.c6, ft2.c8, ft2.ctid
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, NULL, c8, ctid FROM "S 1"."T 1" FOR UPDATE
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c8, ctid FROM "S 1"."T 1" FOR UPDATE
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-> Hash
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Output: ft1.*, ft1.c1
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-> Foreign Scan on public.ft1
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@ -978,112 +978,124 @@ UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
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UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
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FROM ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 9;
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DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING *;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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------+-----+------------+------------------------------+--------------------------+----+------------+-----
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5 | 5 | 00005 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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15 | 5 | 00015 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
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25 | 5 | 00025 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
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35 | 5 | 00035 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
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45 | 5 | 00045 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
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55 | 5 | 00055 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
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65 | 5 | 00065 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
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75 | 5 | 00075 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
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85 | 5 | 00085 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
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95 | 5 | 00095 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
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105 | 5 | 00105 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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115 | 5 | 00115 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
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125 | 5 | 00125 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
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135 | 5 | 00135 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
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145 | 5 | 00145 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
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155 | 5 | 00155 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
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165 | 5 | 00165 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
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175 | 5 | 00175 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
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185 | 5 | 00185 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
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195 | 5 | 00195 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
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205 | 5 | 00205 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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215 | 5 | 00215 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
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225 | 5 | 00225 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
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235 | 5 | 00235 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
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245 | 5 | 00245 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
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255 | 5 | 00255 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
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265 | 5 | 00265 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
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275 | 5 | 00275 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
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285 | 5 | 00285 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
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295 | 5 | 00295 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
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305 | 5 | 00305 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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315 | 5 | 00315 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
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325 | 5 | 00325 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
335 | 5 | 00335 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
345 | 5 | 00345 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
355 | 5 | 00355 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
365 | 5 | 00365 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
375 | 5 | 00375 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
385 | 5 | 00385 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
395 | 5 | 00395 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
405 | 5 | 00405 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
|
||||
415 | 5 | 00415 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
|
||||
425 | 5 | 00425 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
435 | 5 | 00435 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
445 | 5 | 00445 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
455 | 5 | 00455 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
465 | 5 | 00465 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
475 | 5 | 00475 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
485 | 5 | 00485 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
495 | 5 | 00495 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
505 | 5 | 00505 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
|
||||
515 | 5 | 00515 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
|
||||
525 | 5 | 00525 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
535 | 5 | 00535 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
545 | 5 | 00545 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
555 | 5 | 00555 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
565 | 5 | 00565 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
575 | 5 | 00575 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
585 | 5 | 00585 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
595 | 5 | 00595 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
605 | 5 | 00605 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
|
||||
615 | 5 | 00615 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
|
||||
625 | 5 | 00625 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
635 | 5 | 00635 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
645 | 5 | 00645 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
655 | 5 | 00655 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
665 | 5 | 00665 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
675 | 5 | 00675 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
685 | 5 | 00685 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
695 | 5 | 00695 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
705 | 5 | 00705 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
|
||||
715 | 5 | 00715 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
|
||||
725 | 5 | 00725 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
735 | 5 | 00735 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
745 | 5 | 00745 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
755 | 5 | 00755 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
765 | 5 | 00765 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
775 | 5 | 00775 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
785 | 5 | 00785 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
795 | 5 | 00795 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
805 | 5 | 00805 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
|
||||
815 | 5 | 00815 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
|
||||
825 | 5 | 00825 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
835 | 5 | 00835 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
845 | 5 | 00845 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
855 | 5 | 00855 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
865 | 5 | 00865 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
875 | 5 | 00875 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
885 | 5 | 00885 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
895 | 5 | 00895 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
905 | 5 | 00905 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
|
||||
915 | 5 | 00915 | Fri Jan 16 00:00:00 1970 PST | Fri Jan 16 00:00:00 1970 | 5 | 5 | foo
|
||||
925 | 5 | 00925 | Mon Jan 26 00:00:00 1970 PST | Mon Jan 26 00:00:00 1970 | 5 | 5 | foo
|
||||
935 | 5 | 00935 | Thu Feb 05 00:00:00 1970 PST | Thu Feb 05 00:00:00 1970 | 5 | 5 | foo
|
||||
945 | 5 | 00945 | Sun Feb 15 00:00:00 1970 PST | Sun Feb 15 00:00:00 1970 | 5 | 5 | foo
|
||||
955 | 5 | 00955 | Wed Feb 25 00:00:00 1970 PST | Wed Feb 25 00:00:00 1970 | 5 | 5 | foo
|
||||
965 | 5 | 00965 | Sat Mar 07 00:00:00 1970 PST | Sat Mar 07 00:00:00 1970 | 5 | 5 | foo
|
||||
975 | 5 | 00975 | Tue Mar 17 00:00:00 1970 PST | Tue Mar 17 00:00:00 1970 | 5 | 5 | foo
|
||||
985 | 5 | 00985 | Fri Mar 27 00:00:00 1970 PST | Fri Mar 27 00:00:00 1970 | 5 | 5 | foo
|
||||
995 | 5 | 00995 | Mon Apr 06 00:00:00 1970 PST | Mon Apr 06 00:00:00 1970 | 5 | 5 | foo
|
||||
1005 | 105 | 0000500005 | | | | ft2 |
|
||||
1015 | 105 | 0001500015 | | | | ft2 |
|
||||
1105 | 205 | eee | | | | ft2 |
|
||||
EXPLAIN (verbose, costs off)
|
||||
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4;
|
||||
QUERY PLAN
|
||||
----------------------------------------------------------------------------------------
|
||||
Delete on public.ft2
|
||||
Output: c1, c4
|
||||
Remote SQL: DELETE FROM "S 1"."T 1" WHERE ctid = $1 RETURNING "C 1", c4
|
||||
-> Foreign Scan on public.ft2
|
||||
Output: ctid
|
||||
Remote SQL: SELECT ctid FROM "S 1"."T 1" WHERE ((("C 1" % 10) = 5)) FOR UPDATE
|
||||
(6 rows)
|
||||
|
||||
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4;
|
||||
c1 | c4
|
||||
------+------------------------------
|
||||
5 | Tue Jan 06 00:00:00 1970 PST
|
||||
15 | Fri Jan 16 00:00:00 1970 PST
|
||||
25 | Mon Jan 26 00:00:00 1970 PST
|
||||
35 | Thu Feb 05 00:00:00 1970 PST
|
||||
45 | Sun Feb 15 00:00:00 1970 PST
|
||||
55 | Wed Feb 25 00:00:00 1970 PST
|
||||
65 | Sat Mar 07 00:00:00 1970 PST
|
||||
75 | Tue Mar 17 00:00:00 1970 PST
|
||||
85 | Fri Mar 27 00:00:00 1970 PST
|
||||
95 | Mon Apr 06 00:00:00 1970 PST
|
||||
105 | Tue Jan 06 00:00:00 1970 PST
|
||||
115 | Fri Jan 16 00:00:00 1970 PST
|
||||
125 | Mon Jan 26 00:00:00 1970 PST
|
||||
135 | Thu Feb 05 00:00:00 1970 PST
|
||||
145 | Sun Feb 15 00:00:00 1970 PST
|
||||
155 | Wed Feb 25 00:00:00 1970 PST
|
||||
165 | Sat Mar 07 00:00:00 1970 PST
|
||||
175 | Tue Mar 17 00:00:00 1970 PST
|
||||
185 | Fri Mar 27 00:00:00 1970 PST
|
||||
195 | Mon Apr 06 00:00:00 1970 PST
|
||||
205 | Tue Jan 06 00:00:00 1970 PST
|
||||
215 | Fri Jan 16 00:00:00 1970 PST
|
||||
225 | Mon Jan 26 00:00:00 1970 PST
|
||||
235 | Thu Feb 05 00:00:00 1970 PST
|
||||
245 | Sun Feb 15 00:00:00 1970 PST
|
||||
255 | Wed Feb 25 00:00:00 1970 PST
|
||||
265 | Sat Mar 07 00:00:00 1970 PST
|
||||
275 | Tue Mar 17 00:00:00 1970 PST
|
||||
285 | Fri Mar 27 00:00:00 1970 PST
|
||||
295 | Mon Apr 06 00:00:00 1970 PST
|
||||
305 | Tue Jan 06 00:00:00 1970 PST
|
||||
315 | Fri Jan 16 00:00:00 1970 PST
|
||||
325 | Mon Jan 26 00:00:00 1970 PST
|
||||
335 | Thu Feb 05 00:00:00 1970 PST
|
||||
345 | Sun Feb 15 00:00:00 1970 PST
|
||||
355 | Wed Feb 25 00:00:00 1970 PST
|
||||
365 | Sat Mar 07 00:00:00 1970 PST
|
||||
375 | Tue Mar 17 00:00:00 1970 PST
|
||||
385 | Fri Mar 27 00:00:00 1970 PST
|
||||
395 | Mon Apr 06 00:00:00 1970 PST
|
||||
405 | Tue Jan 06 00:00:00 1970 PST
|
||||
415 | Fri Jan 16 00:00:00 1970 PST
|
||||
425 | Mon Jan 26 00:00:00 1970 PST
|
||||
435 | Thu Feb 05 00:00:00 1970 PST
|
||||
445 | Sun Feb 15 00:00:00 1970 PST
|
||||
455 | Wed Feb 25 00:00:00 1970 PST
|
||||
465 | Sat Mar 07 00:00:00 1970 PST
|
||||
475 | Tue Mar 17 00:00:00 1970 PST
|
||||
485 | Fri Mar 27 00:00:00 1970 PST
|
||||
495 | Mon Apr 06 00:00:00 1970 PST
|
||||
505 | Tue Jan 06 00:00:00 1970 PST
|
||||
515 | Fri Jan 16 00:00:00 1970 PST
|
||||
525 | Mon Jan 26 00:00:00 1970 PST
|
||||
535 | Thu Feb 05 00:00:00 1970 PST
|
||||
545 | Sun Feb 15 00:00:00 1970 PST
|
||||
555 | Wed Feb 25 00:00:00 1970 PST
|
||||
565 | Sat Mar 07 00:00:00 1970 PST
|
||||
575 | Tue Mar 17 00:00:00 1970 PST
|
||||
585 | Fri Mar 27 00:00:00 1970 PST
|
||||
595 | Mon Apr 06 00:00:00 1970 PST
|
||||
605 | Tue Jan 06 00:00:00 1970 PST
|
||||
615 | Fri Jan 16 00:00:00 1970 PST
|
||||
625 | Mon Jan 26 00:00:00 1970 PST
|
||||
635 | Thu Feb 05 00:00:00 1970 PST
|
||||
645 | Sun Feb 15 00:00:00 1970 PST
|
||||
655 | Wed Feb 25 00:00:00 1970 PST
|
||||
665 | Sat Mar 07 00:00:00 1970 PST
|
||||
675 | Tue Mar 17 00:00:00 1970 PST
|
||||
685 | Fri Mar 27 00:00:00 1970 PST
|
||||
695 | Mon Apr 06 00:00:00 1970 PST
|
||||
705 | Tue Jan 06 00:00:00 1970 PST
|
||||
715 | Fri Jan 16 00:00:00 1970 PST
|
||||
725 | Mon Jan 26 00:00:00 1970 PST
|
||||
735 | Thu Feb 05 00:00:00 1970 PST
|
||||
745 | Sun Feb 15 00:00:00 1970 PST
|
||||
755 | Wed Feb 25 00:00:00 1970 PST
|
||||
765 | Sat Mar 07 00:00:00 1970 PST
|
||||
775 | Tue Mar 17 00:00:00 1970 PST
|
||||
785 | Fri Mar 27 00:00:00 1970 PST
|
||||
795 | Mon Apr 06 00:00:00 1970 PST
|
||||
805 | Tue Jan 06 00:00:00 1970 PST
|
||||
815 | Fri Jan 16 00:00:00 1970 PST
|
||||
825 | Mon Jan 26 00:00:00 1970 PST
|
||||
835 | Thu Feb 05 00:00:00 1970 PST
|
||||
845 | Sun Feb 15 00:00:00 1970 PST
|
||||
855 | Wed Feb 25 00:00:00 1970 PST
|
||||
865 | Sat Mar 07 00:00:00 1970 PST
|
||||
875 | Tue Mar 17 00:00:00 1970 PST
|
||||
885 | Fri Mar 27 00:00:00 1970 PST
|
||||
895 | Mon Apr 06 00:00:00 1970 PST
|
||||
905 | Tue Jan 06 00:00:00 1970 PST
|
||||
915 | Fri Jan 16 00:00:00 1970 PST
|
||||
925 | Mon Jan 26 00:00:00 1970 PST
|
||||
935 | Thu Feb 05 00:00:00 1970 PST
|
||||
945 | Sun Feb 15 00:00:00 1970 PST
|
||||
955 | Wed Feb 25 00:00:00 1970 PST
|
||||
965 | Sat Mar 07 00:00:00 1970 PST
|
||||
975 | Tue Mar 17 00:00:00 1970 PST
|
||||
985 | Fri Mar 27 00:00:00 1970 PST
|
||||
995 | Mon Apr 06 00:00:00 1970 PST
|
||||
1005 |
|
||||
1015 |
|
||||
1105 |
|
||||
(103 rows)
|
||||
|
||||
EXPLAIN (verbose, costs off)
|
||||
|
|
@ -1097,7 +1109,7 @@ DELETE FROM ft2 USING ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 2;
|
|||
Hash Cond: (ft2.c2 = ft1.c1)
|
||||
-> Foreign Scan on public.ft2
|
||||
Output: ft2.ctid, ft2.c2
|
||||
Remote SQL: SELECT NULL, c2, NULL, NULL, NULL, NULL, NULL, NULL, ctid FROM "S 1"."T 1" FOR UPDATE
|
||||
Remote SQL: SELECT c2, ctid FROM "S 1"."T 1" FOR UPDATE
|
||||
-> Hash
|
||||
Output: ft1.*, ft1.c1
|
||||
-> Foreign Scan on public.ft1
|
||||
|
|
|
|||
|
|
@ -84,9 +84,10 @@ typedef struct PgFdwRelationInfo
|
|||
* Indexes of FDW-private information stored in fdw_private lists.
|
||||
*
|
||||
* We store various information in ForeignScan.fdw_private to pass it from
|
||||
* planner to executor. Currently there is just:
|
||||
* planner to executor. Currently we store:
|
||||
*
|
||||
* 1) SELECT statement text to be sent to the remote server
|
||||
* 2) Integer list of attribute numbers retrieved by the SELECT
|
||||
*
|
||||
* These items are indexed with the enum FdwScanPrivateIndex, so an item
|
||||
* can be fetched with list_nth(). For example, to get the SELECT statement:
|
||||
|
|
@ -95,7 +96,9 @@ typedef struct PgFdwRelationInfo
|
|||
enum FdwScanPrivateIndex
|
||||
{
|
||||
/* SQL statement to execute remotely (as a String node) */
|
||||
FdwScanPrivateSelectSql
|
||||
FdwScanPrivateSelectSql,
|
||||
/* Integer list of attribute numbers retrieved by the SELECT */
|
||||
FdwScanPrivateRetrievedAttrs
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -106,6 +109,7 @@ enum FdwScanPrivateIndex
|
|||
* 2) Integer list of target attribute numbers for INSERT/UPDATE
|
||||
* (NIL for a DELETE)
|
||||
* 3) Boolean flag showing if there's a RETURNING clause
|
||||
* 4) Integer list of attribute numbers retrieved by RETURNING, if any
|
||||
*/
|
||||
enum FdwModifyPrivateIndex
|
||||
{
|
||||
|
|
@ -114,7 +118,9 @@ enum FdwModifyPrivateIndex
|
|||
/* Integer list of target attribute numbers for INSERT/UPDATE */
|
||||
FdwModifyPrivateTargetAttnums,
|
||||
/* has-returning flag (as an integer Value node) */
|
||||
FdwModifyPrivateHasReturning
|
||||
FdwModifyPrivateHasReturning,
|
||||
/* Integer list of attribute numbers retrieved by RETURNING */
|
||||
FdwModifyPrivateRetrievedAttrs
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -125,7 +131,9 @@ typedef struct PgFdwScanState
|
|||
Relation rel; /* relcache entry for the foreign table */
|
||||
AttInMetadata *attinmeta; /* attribute datatype conversion metadata */
|
||||
|
||||
List *fdw_private; /* FDW-private information from planner */
|
||||
/* extracted fdw_private data */
|
||||
char *query; /* text of SELECT command */
|
||||
List *retrieved_attrs; /* list of retrieved attribute numbers */
|
||||
|
||||
/* for remote query execution */
|
||||
PGconn *conn; /* connection for the scan */
|
||||
|
|
@ -166,6 +174,7 @@ typedef struct PgFdwModifyState
|
|||
char *query; /* text of INSERT/UPDATE/DELETE command */
|
||||
List *target_attrs; /* list of target attribute numbers */
|
||||
bool has_returning; /* is there a RETURNING clause? */
|
||||
List *retrieved_attrs; /* attr numbers retrieved by RETURNING */
|
||||
|
||||
/* info about parameters for prepared statement */
|
||||
AttrNumber ctidAttno; /* attnum of input resjunk ctid column */
|
||||
|
|
@ -183,6 +192,7 @@ typedef struct PgFdwAnalyzeState
|
|||
{
|
||||
Relation rel; /* relcache entry for the foreign table */
|
||||
AttInMetadata *attinmeta; /* attribute datatype conversion metadata */
|
||||
List *retrieved_attrs; /* attr numbers retrieved by query */
|
||||
|
||||
/* collected sample rows */
|
||||
HeapTuple *rows; /* array of size targrows */
|
||||
|
|
@ -314,6 +324,7 @@ static HeapTuple make_tuple_from_result_row(PGresult *res,
|
|||
int row,
|
||||
Relation rel,
|
||||
AttInMetadata *attinmeta,
|
||||
List *retrieved_attrs,
|
||||
MemoryContext temp_context);
|
||||
static void conversion_error_callback(void *arg);
|
||||
|
||||
|
|
@ -728,6 +739,7 @@ postgresGetForeignPlan(PlannerInfo *root,
|
|||
List *remote_conds = NIL;
|
||||
List *local_exprs = NIL;
|
||||
List *params_list = NIL;
|
||||
List *retrieved_attrs;
|
||||
StringInfoData sql;
|
||||
ListCell *lc;
|
||||
|
||||
|
|
@ -777,7 +789,8 @@ postgresGetForeignPlan(PlannerInfo *root,
|
|||
* expressions to be sent as parameters.
|
||||
*/
|
||||
initStringInfo(&sql);
|
||||
deparseSelectSql(&sql, root, baserel, fpinfo->attrs_used);
|
||||
deparseSelectSql(&sql, root, baserel, fpinfo->attrs_used,
|
||||
&retrieved_attrs);
|
||||
if (remote_conds)
|
||||
appendWhereClause(&sql, root, baserel, remote_conds,
|
||||
true, ¶ms_list);
|
||||
|
|
@ -829,7 +842,8 @@ postgresGetForeignPlan(PlannerInfo *root,
|
|||
* Build the fdw_private list that will be available to the executor.
|
||||
* Items in the list must match enum FdwScanPrivateIndex, above.
|
||||
*/
|
||||
fdw_private = list_make1(makeString(sql.data));
|
||||
fdw_private = list_make2(makeString(sql.data),
|
||||
retrieved_attrs);
|
||||
|
||||
/*
|
||||
* Create the ForeignScan node from target list, local filtering
|
||||
|
|
@ -901,7 +915,10 @@ postgresBeginForeignScan(ForeignScanState *node, int eflags)
|
|||
fsstate->cursor_exists = false;
|
||||
|
||||
/* Get private info created by planner functions. */
|
||||
fsstate->fdw_private = fsplan->fdw_private;
|
||||
fsstate->query = strVal(list_nth(fsplan->fdw_private,
|
||||
FdwScanPrivateSelectSql));
|
||||
fsstate->retrieved_attrs = (List *) list_nth(fsplan->fdw_private,
|
||||
FdwScanPrivateRetrievedAttrs);
|
||||
|
||||
/* Create contexts for batches of tuples and per-tuple temp workspace. */
|
||||
fsstate->batch_cxt = AllocSetContextCreate(estate->es_query_cxt,
|
||||
|
|
@ -915,7 +932,7 @@ postgresBeginForeignScan(ForeignScanState *node, int eflags)
|
|||
ALLOCSET_SMALL_INITSIZE,
|
||||
ALLOCSET_SMALL_MAXSIZE);
|
||||
|
||||
/* Get info we'll need for data conversion. */
|
||||
/* Get info we'll need for input data conversion. */
|
||||
fsstate->attinmeta = TupleDescGetAttInMetadata(RelationGetDescr(fsstate->rel));
|
||||
|
||||
/* Prepare for output conversion of parameters used in remote query. */
|
||||
|
|
@ -1138,6 +1155,7 @@ postgresPlanForeignModify(PlannerInfo *root,
|
|||
StringInfoData sql;
|
||||
List *targetAttrs = NIL;
|
||||
List *returningList = NIL;
|
||||
List *retrieved_attrs = NIL;
|
||||
|
||||
initStringInfo(&sql);
|
||||
|
||||
|
|
@ -1194,15 +1212,18 @@ postgresPlanForeignModify(PlannerInfo *root,
|
|||
{
|
||||
case CMD_INSERT:
|
||||
deparseInsertSql(&sql, root, resultRelation, rel,
|
||||
targetAttrs, returningList);
|
||||
targetAttrs, returningList,
|
||||
&retrieved_attrs);
|
||||
break;
|
||||
case CMD_UPDATE:
|
||||
deparseUpdateSql(&sql, root, resultRelation, rel,
|
||||
targetAttrs, returningList);
|
||||
targetAttrs, returningList,
|
||||
&retrieved_attrs);
|
||||
break;
|
||||
case CMD_DELETE:
|
||||
deparseDeleteSql(&sql, root, resultRelation, rel,
|
||||
returningList);
|
||||
returningList,
|
||||
&retrieved_attrs);
|
||||
break;
|
||||
default:
|
||||
elog(ERROR, "unexpected operation: %d", (int) operation);
|
||||
|
|
@ -1215,9 +1236,10 @@ postgresPlanForeignModify(PlannerInfo *root,
|
|||
* Build the fdw_private list that will be available to the executor.
|
||||
* Items in the list must match enum FdwModifyPrivateIndex, above.
|
||||
*/
|
||||
return list_make3(makeString(sql.data),
|
||||
return list_make4(makeString(sql.data),
|
||||
targetAttrs,
|
||||
makeInteger((returningList != NIL)));
|
||||
makeInteger((returningList != NIL)),
|
||||
retrieved_attrs);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1279,6 +1301,8 @@ postgresBeginForeignModify(ModifyTableState *mtstate,
|
|||
FdwModifyPrivateTargetAttnums);
|
||||
fmstate->has_returning = intVal(list_nth(fdw_private,
|
||||
FdwModifyPrivateHasReturning));
|
||||
fmstate->retrieved_attrs = (List *) list_nth(fdw_private,
|
||||
FdwModifyPrivateRetrievedAttrs);
|
||||
|
||||
/* Create context for per-tuple temp workspace. */
|
||||
fmstate->temp_cxt = AllocSetContextCreate(estate->es_query_cxt,
|
||||
|
|
@ -1641,6 +1665,7 @@ estimate_path_cost_size(PlannerInfo *root,
|
|||
if (fpinfo->use_remote_estimate)
|
||||
{
|
||||
StringInfoData sql;
|
||||
List *retrieved_attrs;
|
||||
PGconn *conn;
|
||||
|
||||
/*
|
||||
|
|
@ -1650,7 +1675,8 @@ estimate_path_cost_size(PlannerInfo *root,
|
|||
*/
|
||||
initStringInfo(&sql);
|
||||
appendStringInfoString(&sql, "EXPLAIN ");
|
||||
deparseSelectSql(&sql, root, baserel, fpinfo->attrs_used);
|
||||
deparseSelectSql(&sql, root, baserel, fpinfo->attrs_used,
|
||||
&retrieved_attrs);
|
||||
if (fpinfo->remote_conds)
|
||||
appendWhereClause(&sql, root, baserel, fpinfo->remote_conds,
|
||||
true, NULL);
|
||||
|
|
@ -1819,7 +1845,6 @@ create_cursor(ForeignScanState *node)
|
|||
int numParams = fsstate->numParams;
|
||||
const char **values = fsstate->param_values;
|
||||
PGconn *conn = fsstate->conn;
|
||||
char *sql;
|
||||
StringInfoData buf;
|
||||
PGresult *res;
|
||||
|
||||
|
|
@ -1867,10 +1892,9 @@ create_cursor(ForeignScanState *node)
|
|||
}
|
||||
|
||||
/* Construct the DECLARE CURSOR command */
|
||||
sql = strVal(list_nth(fsstate->fdw_private, FdwScanPrivateSelectSql));
|
||||
initStringInfo(&buf);
|
||||
appendStringInfo(&buf, "DECLARE c%u CURSOR FOR\n%s",
|
||||
fsstate->cursor_number, sql);
|
||||
fsstate->cursor_number, fsstate->query);
|
||||
|
||||
/*
|
||||
* Notice that we pass NULL for paramTypes, thus forcing the remote server
|
||||
|
|
@ -1885,7 +1909,7 @@ create_cursor(ForeignScanState *node)
|
|||
res = PQexecParams(conn, buf.data, numParams, NULL, values,
|
||||
NULL, NULL, 0);
|
||||
if (PQresultStatus(res) != PGRES_COMMAND_OK)
|
||||
pgfdw_report_error(ERROR, res, true, sql);
|
||||
pgfdw_report_error(ERROR, res, true, fsstate->query);
|
||||
PQclear(res);
|
||||
|
||||
/* Mark the cursor as created, and show no tuples have been retrieved */
|
||||
|
|
@ -1936,9 +1960,7 @@ fetch_more_data(ForeignScanState *node)
|
|||
res = PQexec(conn, sql);
|
||||
/* On error, report the original query, not the FETCH. */
|
||||
if (PQresultStatus(res) != PGRES_TUPLES_OK)
|
||||
pgfdw_report_error(ERROR, res, false,
|
||||
strVal(list_nth(fsstate->fdw_private,
|
||||
FdwScanPrivateSelectSql)));
|
||||
pgfdw_report_error(ERROR, res, false, fsstate->query);
|
||||
|
||||
/* Convert the data into HeapTuples */
|
||||
numrows = PQntuples(res);
|
||||
|
|
@ -1952,6 +1974,7 @@ fetch_more_data(ForeignScanState *node)
|
|||
make_tuple_from_result_row(res, i,
|
||||
fsstate->rel,
|
||||
fsstate->attinmeta,
|
||||
fsstate->retrieved_attrs,
|
||||
fsstate->temp_cxt);
|
||||
}
|
||||
|
||||
|
|
@ -2170,6 +2193,7 @@ store_returning_result(PgFdwModifyState *fmstate,
|
|||
newtup = make_tuple_from_result_row(res, 0,
|
||||
fmstate->rel,
|
||||
fmstate->attinmeta,
|
||||
fmstate->retrieved_attrs,
|
||||
fmstate->temp_cxt);
|
||||
/* tuple will be deleted when it is cleared from the slot */
|
||||
ExecStoreTuple(newtup, slot, InvalidBuffer, true);
|
||||
|
|
@ -2316,7 +2340,7 @@ postgresAcquireSampleRowsFunc(Relation relation, int elevel,
|
|||
cursor_number = GetCursorNumber(conn);
|
||||
initStringInfo(&sql);
|
||||
appendStringInfo(&sql, "DECLARE c%u CURSOR FOR ", cursor_number);
|
||||
deparseAnalyzeSql(&sql, relation);
|
||||
deparseAnalyzeSql(&sql, relation, &astate.retrieved_attrs);
|
||||
|
||||
/* In what follows, do not risk leaking any PGresults. */
|
||||
PG_TRY();
|
||||
|
|
@ -2461,6 +2485,7 @@ analyze_row_processor(PGresult *res, int row, PgFdwAnalyzeState *astate)
|
|||
astate->rows[pos] = make_tuple_from_result_row(res, row,
|
||||
astate->rel,
|
||||
astate->attinmeta,
|
||||
astate->retrieved_attrs,
|
||||
astate->temp_cxt);
|
||||
|
||||
MemoryContextSwitchTo(oldcontext);
|
||||
|
|
@ -2471,26 +2496,27 @@ analyze_row_processor(PGresult *res, int row, PgFdwAnalyzeState *astate)
|
|||
* Create a tuple from the specified row of the PGresult.
|
||||
*
|
||||
* rel is the local representation of the foreign table, attinmeta is
|
||||
* conversion data for the rel's tupdesc, and temp_context is a working
|
||||
* context that can be reset after each tuple.
|
||||
* conversion data for the rel's tupdesc, and retrieved_attrs is an
|
||||
* integer list of the table column numbers present in the PGresult.
|
||||
* temp_context is a working context that can be reset after each tuple.
|
||||
*/
|
||||
static HeapTuple
|
||||
make_tuple_from_result_row(PGresult *res,
|
||||
int row,
|
||||
Relation rel,
|
||||
AttInMetadata *attinmeta,
|
||||
List *retrieved_attrs,
|
||||
MemoryContext temp_context)
|
||||
{
|
||||
HeapTuple tuple;
|
||||
TupleDesc tupdesc = RelationGetDescr(rel);
|
||||
Form_pg_attribute *attrs = tupdesc->attrs;
|
||||
Datum *values;
|
||||
bool *nulls;
|
||||
ItemPointer ctid = NULL;
|
||||
ConversionLocation errpos;
|
||||
ErrorContextCallback errcallback;
|
||||
MemoryContext oldcontext;
|
||||
int i;
|
||||
ListCell *lc;
|
||||
int j;
|
||||
|
||||
Assert(row < PQntuples(res));
|
||||
|
|
@ -2502,8 +2528,10 @@ make_tuple_from_result_row(PGresult *res,
|
|||
*/
|
||||
oldcontext = MemoryContextSwitchTo(temp_context);
|
||||
|
||||
values = (Datum *) palloc(tupdesc->natts * sizeof(Datum));
|
||||
values = (Datum *) palloc0(tupdesc->natts * sizeof(Datum));
|
||||
nulls = (bool *) palloc(tupdesc->natts * sizeof(bool));
|
||||
/* Initialize to nulls for any columns not present in result */
|
||||
memset(nulls, true, tupdesc->natts * sizeof(bool));
|
||||
|
||||
/*
|
||||
* Set up and install callback to report where conversion error occurs.
|
||||
|
|
@ -2517,63 +2545,56 @@ make_tuple_from_result_row(PGresult *res,
|
|||
|
||||
/*
|
||||
* i indexes columns in the relation, j indexes columns in the PGresult.
|
||||
* We assume dropped columns are not represented in the PGresult.
|
||||
*/
|
||||
for (i = 0, j = 0; i < tupdesc->natts; i++)
|
||||
j = 0;
|
||||
foreach(lc, retrieved_attrs)
|
||||
{
|
||||
int i = lfirst_int(lc);
|
||||
char *valstr;
|
||||
|
||||
/* skip dropped columns. */
|
||||
if (attrs[i]->attisdropped)
|
||||
{
|
||||
values[i] = (Datum) 0;
|
||||
nulls[i] = true;
|
||||
continue;
|
||||
}
|
||||
/* fetch next column's textual value */
|
||||
if (PQgetisnull(res, row, j))
|
||||
valstr = NULL;
|
||||
else
|
||||
valstr = PQgetvalue(res, row, j);
|
||||
|
||||
/* convert value to internal representation */
|
||||
if (PQgetisnull(res, row, j))
|
||||
if (i > 0)
|
||||
{
|
||||
valstr = NULL;
|
||||
nulls[i] = true;
|
||||
/* ordinary column */
|
||||
Assert(i <= tupdesc->natts);
|
||||
nulls[i - 1] = (valstr == NULL);
|
||||
/* Apply the input function even to nulls, to support domains */
|
||||
errpos.cur_attno = i;
|
||||
values[i - 1] = InputFunctionCall(&attinmeta->attinfuncs[i - 1],
|
||||
valstr,
|
||||
attinmeta->attioparams[i - 1],
|
||||
attinmeta->atttypmods[i - 1]);
|
||||
errpos.cur_attno = 0;
|
||||
}
|
||||
else
|
||||
else if (i == SelfItemPointerAttributeNumber)
|
||||
{
|
||||
valstr = PQgetvalue(res, row, j);
|
||||
nulls[i] = false;
|
||||
/* ctid --- note we ignore any other system column in result */
|
||||
if (valstr != NULL)
|
||||
{
|
||||
Datum datum;
|
||||
|
||||
datum = DirectFunctionCall1(tidin, CStringGetDatum(valstr));
|
||||
ctid = (ItemPointer) DatumGetPointer(datum);
|
||||
}
|
||||
}
|
||||
|
||||
/* Note: apply the input function even to nulls, to support domains */
|
||||
errpos.cur_attno = i + 1;
|
||||
values[i] = InputFunctionCall(&attinmeta->attinfuncs[i],
|
||||
valstr,
|
||||
attinmeta->attioparams[i],
|
||||
attinmeta->atttypmods[i]);
|
||||
errpos.cur_attno = 0;
|
||||
|
||||
j++;
|
||||
}
|
||||
|
||||
/*
|
||||
* Convert ctid if present. XXX we could stand to have a cleaner way of
|
||||
* detecting whether ctid is included in the result.
|
||||
*/
|
||||
if (j < PQnfields(res))
|
||||
{
|
||||
char *valstr;
|
||||
Datum datum;
|
||||
|
||||
valstr = PQgetvalue(res, row, j);
|
||||
datum = DirectFunctionCall1(tidin, CStringGetDatum(valstr));
|
||||
ctid = (ItemPointer) DatumGetPointer(datum);
|
||||
j++;
|
||||
}
|
||||
|
||||
/* Uninstall error context callback. */
|
||||
error_context_stack = errcallback.previous;
|
||||
|
||||
/* check result and tuple descriptor have the same number of columns */
|
||||
if (j != PQnfields(res))
|
||||
/*
|
||||
* Check we got the expected number of columns. Note: j == 0 and
|
||||
* PQnfields == 1 is expected, since deparse emits a NULL if no columns.
|
||||
*/
|
||||
if (j > 0 && j != PQnfields(res))
|
||||
elog(ERROR, "remote query result does not match the foreign table");
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -49,7 +49,8 @@ extern bool is_foreign_expr(PlannerInfo *root,
|
|||
extern void deparseSelectSql(StringInfo buf,
|
||||
PlannerInfo *root,
|
||||
RelOptInfo *baserel,
|
||||
Bitmapset *attrs_used);
|
||||
Bitmapset *attrs_used,
|
||||
List **retrieved_attrs);
|
||||
extern void appendWhereClause(StringInfo buf,
|
||||
PlannerInfo *root,
|
||||
RelOptInfo *baserel,
|
||||
|
|
@ -58,14 +59,18 @@ extern void appendWhereClause(StringInfo buf,
|
|||
List **params);
|
||||
extern void deparseInsertSql(StringInfo buf, PlannerInfo *root,
|
||||
Index rtindex, Relation rel,
|
||||
List *targetAttrs, List *returningList);
|
||||
List *targetAttrs, List *returningList,
|
||||
List **retrieved_attrs);
|
||||
extern void deparseUpdateSql(StringInfo buf, PlannerInfo *root,
|
||||
Index rtindex, Relation rel,
|
||||
List *targetAttrs, List *returningList);
|
||||
List *targetAttrs, List *returningList,
|
||||
List **retrieved_attrs);
|
||||
extern void deparseDeleteSql(StringInfo buf, PlannerInfo *root,
|
||||
Index rtindex, Relation rel,
|
||||
List *returningList);
|
||||
List *returningList,
|
||||
List **retrieved_attrs);
|
||||
extern void deparseAnalyzeSizeSql(StringInfo buf, Relation rel);
|
||||
extern void deparseAnalyzeSql(StringInfo buf, Relation rel);
|
||||
extern void deparseAnalyzeSql(StringInfo buf, Relation rel,
|
||||
List **retrieved_attrs);
|
||||
|
||||
#endif /* POSTGRES_FDW_H */
|
||||
|
|
|
|||
|
|
@ -311,7 +311,9 @@ UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
|
|||
FROM ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 9;
|
||||
UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
|
||||
FROM ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 9;
|
||||
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING *;
|
||||
EXPLAIN (verbose, costs off)
|
||||
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4;
|
||||
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4;
|
||||
EXPLAIN (verbose, costs off)
|
||||
DELETE FROM ft2 USING ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 2;
|
||||
DELETE FROM ft2 USING ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 2;
|
||||
|
|
|
|||
Loading…
Reference in New Issue