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Remove quick path in ExecInitPartitionInfo for equal tupdescs

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I added this "optimization" on top of Amit Langote's 158b7bc6d779, but
the quick path is never taken because the partition uses a different
pg_type oid than its parent table (causing equalTupleDescs to return
false).  Changing that requires more analysis and is too considered
dangerous at this point in the cycle, so revert it.

We might make it work someday, but not for pg11.

Discussion: https://postgr.es/m/825031be-942c-8c24-6163-13c27f217a3d@lab.ntt.co.jp
This commit is contained in:
Alvaro Herrera 2018-04-19 16:46:53 -03:00
parent 2d625176c0
commit 79b2e52615
1 changed files with 67 additions and 84 deletions
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151
src/backend/executor/execPartition.c
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@ -313,7 +313,6 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
MemoryContext oldContext;
AttrNumber *part_attnos = NULL;
bool found_whole_row;
bool equalTupdescs;
/*
* We locked all the partitions in ExecSetupPartitionTupleRouting
@ -361,10 +360,6 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
(node != NULL &&
node->onConflictAction != ONCONFLICT_NONE));
/* if tuple descs are identical, we don't need to map the attrs */
equalTupdescs = equalTupleDescs(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel));
/*
* Build WITH CHECK OPTION constraints for the partition. Note that we
* didn't build the withCheckOptionList for partitions within the planner,
@ -405,21 +400,18 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
/*
* Convert Vars in it to contain this partition's attribute numbers.
*/
if (!equalTupdescs)
{
part_attnos =
convert_tuples_by_name_map(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel),
gettext_noop("could not convert row type"));
wcoList = (List *)
map_variable_attnos((Node *) wcoList,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
}
part_attnos =
convert_tuples_by_name_map(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel),
gettext_noop("could not convert row type"));
wcoList = (List *)
map_variable_attnos((Node *) wcoList,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
foreach(ll, wcoList)
{
@ -464,25 +456,22 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
*/
returningList = linitial(node->returningLists);
if (!equalTupdescs)
{
/*
* Convert Vars in it to contain this partition's attribute numbers.
*/
if (part_attnos == NULL)
part_attnos =
convert_tuples_by_name_map(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel),
gettext_noop("could not convert row type"));
returningList = (List *)
map_variable_attnos((Node *) returningList,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
}
/*
* Convert Vars in it to contain this partition's attribute numbers.
*/
if (part_attnos == NULL)
part_attnos =
convert_tuples_by_name_map(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel),
gettext_noop("could not convert row type"));
returningList = (List *)
map_variable_attnos((Node *) returningList,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
leaf_part_rri->ri_returningList = returningList;
@ -583,33 +572,30 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
* target relation (firstVarno).
*/
onconflset = (List *) copyObject((Node *) node->onConflictSet);
if (!equalTupdescs)
{
if (part_attnos == NULL)
part_attnos =
convert_tuples_by_name_map(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel),
gettext_noop("could not convert row type"));
onconflset = (List *)
map_variable_attnos((Node *) onconflset,
INNER_VAR, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
onconflset = (List *)
map_variable_attnos((Node *) onconflset,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
if (part_attnos == NULL)
part_attnos =
convert_tuples_by_name_map(RelationGetDescr(partrel),
RelationGetDescr(firstResultRel),
gettext_noop("could not convert row type"));
onconflset = (List *)
map_variable_attnos((Node *) onconflset,
INNER_VAR, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
onconflset = (List *)
map_variable_attnos((Node *) onconflset,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
/* Finally, adjust this tlist to match the partition. */
onconflset = adjust_partition_tlist(onconflset, map);
}
/* Finally, adjust this tlist to match the partition. */
onconflset = adjust_partition_tlist(onconflset, map);
/*
* Build UPDATE SET's projection info. The user of this
@ -637,25 +623,22 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
List *clause;
clause = copyObject((List *) node->onConflictWhere);
if (!equalTupdescs)
{
clause = (List *)
map_variable_attnos((Node *) clause,
INNER_VAR, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
clause = (List *)
map_variable_attnos((Node *) clause,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
}
clause = (List *)
map_variable_attnos((Node *) clause,
INNER_VAR, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
clause = (List *)
map_variable_attnos((Node *) clause,
firstVarno, 0,
part_attnos,
RelationGetDescr(firstResultRel)->natts,
RelationGetForm(partrel)->reltype,
&found_whole_row);
/* We ignore the value of found_whole_row. */
leaf_part_rri->ri_onConflict->oc_WhereClause =
ExecInitQual((List *) clause, &mtstate->ps);
}