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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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11
src/backend/access/common/tupdesc.c
View File

@@ -131,6 +131,7 @@ CreateTupleDescCopy(TupleDesc tupdesc)
att->atthasdef = false;
att->atthasmissing = false;
att->attidentity = '\0';
att->attgenerated = '\0';
}
/* We can copy the tuple type identification, too */
@@ -165,6 +166,7 @@ CreateTupleDescCopyConstr(TupleDesc tupdesc)
TupleConstr *cpy = (TupleConstr *) palloc0(sizeof(TupleConstr));
cpy->has_not_null = constr->has_not_null;
cpy->has_generated_stored = constr->has_generated_stored;
if ((cpy->num_defval = constr->num_defval) > 0)
{
@@ -247,6 +249,7 @@ TupleDescCopy(TupleDesc dst, TupleDesc src)
att->atthasdef = false;
att->atthasmissing = false;
att->attidentity = '\0';
att->attgenerated = '\0';
}
dst->constr = NULL;
@@ -300,6 +303,7 @@ TupleDescCopyEntry(TupleDesc dst, AttrNumber dstAttno,
dstAtt->atthasdef = false;
dstAtt->atthasmissing = false;
dstAtt->attidentity = '\0';
dstAtt->attgenerated = '\0';
}
/*
@@ -456,6 +460,8 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
return false;
if (attr1->attidentity != attr2->attidentity)
return false;
if (attr1->attgenerated != attr2->attgenerated)
return false;
if (attr1->attisdropped != attr2->attisdropped)
return false;
if (attr1->attislocal != attr2->attislocal)
@@ -476,6 +482,8 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
return false;
if (constr1->has_not_null != constr2->has_not_null)
return false;
if (constr1->has_generated_stored != constr2->has_generated_stored)
return false;
n = constr1->num_defval;
if (n != (int) constr2->num_defval)
return false;
@@ -638,6 +646,7 @@ TupleDescInitEntry(TupleDesc desc,
att->atthasdef = false;
att->atthasmissing = false;
att->attidentity = '\0';
att->attgenerated = '\0';
att->attisdropped = false;
att->attislocal = true;
att->attinhcount = 0;
@@ -697,6 +706,7 @@ TupleDescInitBuiltinEntry(TupleDesc desc,
att->atthasdef = false;
att->atthasmissing = false;
att->attidentity = '\0';
att->attgenerated = '\0';
att->attisdropped = false;
att->attislocal = true;
att->attinhcount = 0;
@@ -853,6 +863,7 @@ BuildDescForRelation(List *schema)
TupleConstr *constr = (TupleConstr *) palloc0(sizeof(TupleConstr));
constr->has_not_null = true;
constr->has_generated_stored = false;
constr->defval = NULL;
constr->missing = NULL;
constr->num_defval = 0;