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Add support for not-null constraints on virtual generated columns

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This was left out of the original patch for virtual generated columns
(commit 83ea6c5402).

This just involves a bit of extra work in the executor to expand the
generation expressions and run a "IS NOT NULL" test against them.

There is also a bit of work to make sure that not-null constraints are
checked during a table rewrite.

Author: jian he <jian.universality@gmail.com>
Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Navneet Kumar <thanit3111@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CACJufxHArQysbDkWFmvK+D1TPHQWWTxWN15cMuUaTYX3xhQXgg@mail.gmail.com
This commit is contained in:
Peter Eisentraut
2025-03-28 13:53:37 +01:00
parent 747ddd38cb
commit cdc168ad4b
9 changed files with 363 additions and 122 deletions
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10
src/backend/commands/indexcmds.c
View File

@ -1118,10 +1118,12 @@ DefineIndex(Oid tableId,
if (TupleDescAttr(RelationGetDescr(rel), attno - 1)->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
stmt->isconstraint ?
errmsg("unique constraints on virtual generated columns are not supported") :
errmsg("indexes on virtual generated columns are not supported")));
errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
stmt->primary ?
errmsg("primary keys on virtual generated columns are not supported") :
stmt->isconstraint ?
errmsg("unique constraints on virtual generated columns are not supported") :
errmsg("indexes on virtual generated columns are not supported"));
}
/*