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Generated columns

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This is an SQL-standard feature that allows creating columns that are
computed from expressions rather than assigned, similar to a view or
materialized view but on a column basis.

This implements one kind of generated column: stored (computed on
write).  Another kind, virtual (computed on read), is planned for the
future, and some room is left for it.

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-03-30 08:13:09 +01:00
parent 6b8b5364dd
commit fc22b6623b
84 changed files with 3067 additions and 157 deletions
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6
src/backend/optimizer/util/inherit.c
View File

@@ -280,6 +280,10 @@ expand_partitioned_rtentry(PlannerInfo *root, RangeTblEntry *parentrte,
if (!root->partColsUpdated)
root->partColsUpdated =
has_partition_attrs(parentrel, parentrte->updatedCols, NULL);
/*
* There shouldn't be any generated columns in the partition key.
*/
Assert(!has_partition_attrs(parentrel, parentrte->extraUpdatedCols, NULL));
/*
* If the partitioned table has no partitions, treat this as the
@@ -415,6 +419,8 @@ expand_single_inheritance_child(PlannerInfo *root, RangeTblEntry *parentrte,
appinfo->translated_vars);
childrte->updatedCols = translate_col_privs(parentrte->updatedCols,
appinfo->translated_vars);
childrte->extraUpdatedCols = translate_col_privs(parentrte->extraUpdatedCols,
appinfo->translated_vars);
}
/*

19
src/backend/optimizer/util/plancat.c
View File

@@ -2083,6 +2083,25 @@ has_row_triggers(PlannerInfo *root, Index rti, CmdType event)
return result;
}
bool
has_stored_generated_columns(PlannerInfo *root, Index rti)
{
RangeTblEntry *rte = planner_rt_fetch(rti, root);
Relation relation;
TupleDesc tupdesc;
bool result = false;
/* Assume we already have adequate lock */
relation = heap_open(rte->relid, NoLock);
tupdesc = RelationGetDescr(relation);
result = tupdesc->constr && tupdesc->constr->has_generated_stored;
heap_close(relation, NoLock);
return result;
}
/*
* set_relation_partition_info
*