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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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2
src/backend/nodes/equalfuncs.c
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@@ -2565,6 +2565,7 @@ _equalColumnDef(const ColumnDef *a, const ColumnDef *b)
COMPARE_NODE_FIELD(cooked_default);
COMPARE_SCALAR_FIELD(identity);
COMPARE_NODE_FIELD(identitySequence);
COMPARE_SCALAR_FIELD(generated);
COMPARE_NODE_FIELD(collClause);
COMPARE_SCALAR_FIELD(collOid);
COMPARE_NODE_FIELD(constraints);
@@ -2664,6 +2665,7 @@ _equalRangeTblEntry(const RangeTblEntry *a, const RangeTblEntry *b)
COMPARE_BITMAPSET_FIELD(selectedCols);
COMPARE_BITMAPSET_FIELD(insertedCols);
COMPARE_BITMAPSET_FIELD(updatedCols);
COMPARE_BITMAPSET_FIELD(extraUpdatedCols);
COMPARE_NODE_FIELD(securityQuals);
return true;