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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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40
src/backend/nodes/copyfuncs.c
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@ -2589,6 +2589,38 @@ _copyOnConflictClause(const OnConflictClause *from)
return newnode;
}
static CTESearchClause *
_copyCTESearchClause(const CTESearchClause *from)
{
CTESearchClause *newnode = makeNode(CTESearchClause);
COPY_NODE_FIELD(search_col_list);
COPY_SCALAR_FIELD(search_breadth_first);
COPY_STRING_FIELD(search_seq_column);
COPY_LOCATION_FIELD(location);
return newnode;
}
static CTECycleClause *
_copyCTECycleClause(const CTECycleClause *from)
{
CTECycleClause *newnode = makeNode(CTECycleClause);
COPY_NODE_FIELD(cycle_col_list);
COPY_STRING_FIELD(cycle_mark_column);
COPY_NODE_FIELD(cycle_mark_value);
COPY_NODE_FIELD(cycle_mark_default);
COPY_STRING_FIELD(cycle_path_column);
COPY_LOCATION_FIELD(location);
COPY_SCALAR_FIELD(cycle_mark_type);
COPY_SCALAR_FIELD(cycle_mark_typmod);
COPY_SCALAR_FIELD(cycle_mark_collation);
COPY_SCALAR_FIELD(cycle_mark_neop);
return newnode;
}
static CommonTableExpr *
_copyCommonTableExpr(const CommonTableExpr *from)
{
@ -2598,6 +2630,8 @@ _copyCommonTableExpr(const CommonTableExpr *from)
COPY_NODE_FIELD(aliascolnames);
COPY_SCALAR_FIELD(ctematerialized);
COPY_NODE_FIELD(ctequery);
COPY_NODE_FIELD(search_clause);
COPY_NODE_FIELD(cycle_clause);
COPY_LOCATION_FIELD(location);
COPY_SCALAR_FIELD(cterecursive);
COPY_SCALAR_FIELD(cterefcount);
@ -5682,6 +5716,12 @@ copyObjectImpl(const void *from)
case T_OnConflictClause:
retval = _copyOnConflictClause(from);
break;
case T_CTESearchClause:
retval = _copyCTESearchClause(from);
break;
case T_CTECycleClause:
retval = _copyCTECycleClause(from);
break;
case T_CommonTableExpr:
retval = _copyCommonTableExpr(from);
break;