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SEARCH and CYCLE clauses

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This adds the SQL standard feature that adds the SEARCH and CYCLE
clauses to recursive queries to be able to do produce breadth- or
depth-first search orders and detect cycles.  These clauses can be
rewritten into queries using existing syntax, and that is what this
patch does in the rewriter.

Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/db80ceee-6f97-9b4a-8ee8-3ba0c58e5be2@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2021-02-01 13:54:59 +01:00
parent bb513b364b
commit 3696a600e2
28 changed files with 2301 additions and 33 deletions
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4
src/backend/parser/parse_expr.c
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@ -507,6 +507,7 @@ transformColumnRef(ParseState *pstate, ColumnRef *cref)
case EXPR_KIND_CALL_ARGUMENT:
case EXPR_KIND_COPY_WHERE:
case EXPR_KIND_GENERATED_COLUMN:
case EXPR_KIND_CYCLE_MARK:
/* okay */
break;
@ -1723,6 +1724,7 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
case EXPR_KIND_RETURNING:
case EXPR_KIND_VALUES:
case EXPR_KIND_VALUES_SINGLE:
case EXPR_KIND_CYCLE_MARK:
/* okay */
break;
case EXPR_KIND_CHECK_CONSTRAINT:
@ -3044,6 +3046,8 @@ ParseExprKindName(ParseExprKind exprKind)
return "WHERE";
case EXPR_KIND_GENERATED_COLUMN:
return "GENERATED AS";
case EXPR_KIND_CYCLE_MARK:
return "CYCLE";
/*
* There is intentionally no default: case here, so that the