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Clean up comments

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Reformat some of the comments in MergeAttributes().  A lot of code has
been added here over time, and the comments could use a bit of editing
to make the code flow read better.
This commit is contained in:
Peter Eisentraut 2023-03-08 15:56:32 +01:00
parent 2a71ad64cb
commit b1534ed99d
1 changed files with 53 additions and 17 deletions
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70
src/backend/commands/tablecmds.c
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@ -2562,13 +2562,16 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
Oid defCollId;
/*
* Yes, try to merge the two column definitions. They must
* have the same type, typmod, and collation.
* Yes, try to merge the two column definitions.
*/
ereport(NOTICE,
(errmsg("merging multiple inherited definitions of column \"%s\"",
attributeName)));
def = (ColumnDef *) list_nth(inhSchema, exist_attno - 1);
/*
* Must have the same type and typmod
*/
typenameTypeIdAndMod(NULL, def->typeName, &defTypeId, &deftypmod);
if (defTypeId != attribute->atttypid ||
deftypmod != attribute->atttypmod)
@ -2581,6 +2584,10 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
deftypmod),
format_type_with_typemod(attribute->atttypid,
attribute->atttypmod))));
/*
* Must have the same collation
*/
defCollId = GetColumnDefCollation(NULL, def, defTypeId);
if (defCollId != attribute->attcollation)
ereport(ERROR,
@ -2591,7 +2598,9 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
get_collation_name(defCollId),
get_collation_name(attribute->attcollation))));
/* Copy/check storage parameter */
/*
* Copy/check storage parameter
*/
if (def->storage == 0)
def->storage = attribute->attstorage;
else if (def->storage != attribute->attstorage)
@ -2603,7 +2612,9 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
storage_name(def->storage),
storage_name(attribute->attstorage))));
/* Copy/check compression parameter */
/*
* Copy/check compression parameter
*/
if (CompressionMethodIsValid(attribute->attcompression))
{
const char *compression =
@ -2619,18 +2630,27 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
errdetail("%s versus %s", def->compression, compression)));
}
def->inhcount++;
/* Merge of NOT NULL constraints = OR 'em together */
/*
* Merge of NOT NULL constraints = OR 'em together
*/
def->is_not_null |= attribute->attnotnull;
/* Default and other constraints are handled below */
newattmap->attnums[parent_attno - 1] = exist_attno;
/* Check for GENERATED conflicts */
/*
* Check for GENERATED conflicts
*/
if (def->generated != attribute->attgenerated)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("inherited column \"%s\" has a generation conflict",
attributeName)));
/*
* Default and other constraints are handled below
*/
def->inhcount++;
newattmap->attnums[parent_attno - 1] = exist_attno;
}
else
{
@ -2853,8 +2873,7 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
Assert(!is_partition);
/*
* Yes, try to merge the two column definitions. They must
* have the same type, typmod, and collation.
* Yes, try to merge the two column definitions.
*/
if (exist_attno == schema_attno)
ereport(NOTICE,
@ -2865,6 +2884,10 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
(errmsg("moving and merging column \"%s\" with inherited definition", attributeName),
errdetail("User-specified column moved to the position of the inherited column.")));
def = (ColumnDef *) list_nth(inhSchema, exist_attno - 1);
/*
* Must have the same type and typmod
*/
typenameTypeIdAndMod(NULL, def->typeName, &defTypeId, &deftypmod);
typenameTypeIdAndMod(NULL, newdef->typeName, &newTypeId, &newtypmod);
if (defTypeId != newTypeId || deftypmod != newtypmod)
@ -2877,6 +2900,10 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
deftypmod),
format_type_with_typemod(newTypeId,
newtypmod))));
/*
* Must have the same collation
*/
defcollid = GetColumnDefCollation(NULL, def, defTypeId);
newcollid = GetColumnDefCollation(NULL, newdef, newTypeId);
if (defcollid != newcollid)
@ -2894,7 +2921,9 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
*/
def->identity = newdef->identity;
/* Copy storage parameter */
/*
* Copy storage parameter
*/
if (def->storage == 0)
def->storage = newdef->storage;
else if (newdef->storage != 0 && def->storage != newdef->storage)
@ -2906,7 +2935,9 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
storage_name(def->storage),
storage_name(newdef->storage))));
/* Copy compression parameter */
/*
* Copy compression parameter
*/
if (def->compression == NULL)
def->compression = newdef->compression;
else if (newdef->compression != NULL)
@ -2919,9 +2950,9 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
errdetail("%s versus %s", def->compression, newdef->compression)));
}
/* Mark the column as locally defined */
def->is_local = true;
/* Merge of NOT NULL constraints = OR 'em together */
/*
* Merge of NOT NULL constraints = OR 'em together
*/
def->is_not_null |= newdef->is_not_null;
/*
@ -2962,12 +2993,17 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
errhint("A child table column cannot be generated unless its parent column is.")));
}
/* If new def has a default, override previous default */
/*
* If new def has a default, override previous default
*/
if (newdef->raw_default != NULL)
{
def->raw_default = newdef->raw_default;
def->cooked_default = newdef->cooked_default;
}
/* Mark the column as locally defined */
def->is_local = true;
}
else
{