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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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36
src/backend/nodes/equalfuncs.c
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@@ -2841,6 +2841,34 @@ _equalOnConflictClause(const OnConflictClause *a, const OnConflictClause *b)
return true;
}
static bool
_equalCTESearchClause(const CTESearchClause *a, const CTESearchClause *b)
{
COMPARE_NODE_FIELD(search_col_list);
COMPARE_SCALAR_FIELD(search_breadth_first);
COMPARE_STRING_FIELD(search_seq_column);
COMPARE_LOCATION_FIELD(location);
return true;
}
static bool
_equalCTECycleClause(const CTECycleClause *a, const CTECycleClause *b)
{
COMPARE_NODE_FIELD(cycle_col_list);
COMPARE_STRING_FIELD(cycle_mark_column);
COMPARE_NODE_FIELD(cycle_mark_value);
COMPARE_NODE_FIELD(cycle_mark_default);
COMPARE_STRING_FIELD(cycle_path_column);
COMPARE_LOCATION_FIELD(location);
COMPARE_SCALAR_FIELD(cycle_mark_type);
COMPARE_SCALAR_FIELD(cycle_mark_typmod);
COMPARE_SCALAR_FIELD(cycle_mark_collation);
COMPARE_SCALAR_FIELD(cycle_mark_neop);
return true;
}
static bool
_equalCommonTableExpr(const CommonTableExpr *a, const CommonTableExpr *b)
{
@@ -2848,6 +2876,8 @@ _equalCommonTableExpr(const CommonTableExpr *a, const CommonTableExpr *b)
COMPARE_NODE_FIELD(aliascolnames);
COMPARE_SCALAR_FIELD(ctematerialized);
COMPARE_NODE_FIELD(ctequery);
COMPARE_NODE_FIELD(search_clause);
COMPARE_NODE_FIELD(cycle_clause);
COMPARE_LOCATION_FIELD(location);
COMPARE_SCALAR_FIELD(cterecursive);
COMPARE_SCALAR_FIELD(cterefcount);
@@ -3735,6 +3765,12 @@ equal(const void *a, const void *b)
case T_OnConflictClause:
retval = _equalOnConflictClause(a, b);
break;
case T_CTESearchClause:
retval = _equalCTESearchClause(a, b);
break;
case T_CTECycleClause:
retval = _equalCTECycleClause(a, b);
break;
case T_CommonTableExpr:
retval = _equalCommonTableExpr(a, b);
break;