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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
Download Patch File Download Diff File Expand all files Collapse all files

2
src/backend/nodes/copyfuncs.c
View File

@@ -2390,6 +2390,7 @@ _copyRangeTblEntry(const RangeTblEntry *from)
COPY_BITMAPSET_FIELD(selectedCols);
COPY_BITMAPSET_FIELD(insertedCols);
COPY_BITMAPSET_FIELD(updatedCols);
COPY_BITMAPSET_FIELD(extraUpdatedCols);
COPY_NODE_FIELD(securityQuals);
return newnode;
@@ -2888,6 +2889,7 @@ _copyColumnDef(const ColumnDef *from)
COPY_NODE_FIELD(cooked_default);
COPY_SCALAR_FIELD(identity);
COPY_NODE_FIELD(identitySequence);
COPY_SCALAR_FIELD(generated);
COPY_NODE_FIELD(collClause);
COPY_SCALAR_FIELD(collOid);
COPY_NODE_FIELD(constraints);

2
src/backend/nodes/equalfuncs.c
View File

@@ -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;

9
src/backend/nodes/outfuncs.c
View File

@@ -2792,6 +2792,7 @@ _outColumnDef(StringInfo str, const ColumnDef *node)
WRITE_NODE_FIELD(cooked_default);
WRITE_CHAR_FIELD(identity);
WRITE_NODE_FIELD(identitySequence);
WRITE_CHAR_FIELD(generated);
WRITE_NODE_FIELD(collClause);
WRITE_OID_FIELD(collOid);
WRITE_NODE_FIELD(constraints);
@@ -3096,6 +3097,7 @@ _outRangeTblEntry(StringInfo str, const RangeTblEntry *node)
WRITE_BITMAPSET_FIELD(selectedCols);
WRITE_BITMAPSET_FIELD(insertedCols);
WRITE_BITMAPSET_FIELD(updatedCols);
WRITE_BITMAPSET_FIELD(extraUpdatedCols);
WRITE_NODE_FIELD(securityQuals);
}
@@ -3467,6 +3469,13 @@ _outConstraint(StringInfo str, const Constraint *node)
WRITE_CHAR_FIELD(generated_when);
break;
case CONSTR_GENERATED:
appendStringInfoString(str, "GENERATED");
WRITE_NODE_FIELD(raw_expr);
WRITE_STRING_FIELD(cooked_expr);
WRITE_CHAR_FIELD(generated_when);
break;
case CONSTR_CHECK:
appendStringInfoString(str, "CHECK");
WRITE_BOOL_FIELD(is_no_inherit);

1
src/backend/nodes/readfuncs.c
View File

@@ -1430,6 +1430,7 @@ _readRangeTblEntry(void)
READ_BITMAPSET_FIELD(selectedCols);
READ_BITMAPSET_FIELD(insertedCols);
READ_BITMAPSET_FIELD(updatedCols);
READ_BITMAPSET_FIELD(extraUpdatedCols);
READ_NODE_FIELD(securityQuals);
READ_DONE();