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SEARCH and CYCLE clauses
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
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@ -3077,6 +3077,34 @@ _outWithClause(StringInfo str, const WithClause *node)
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WRITE_LOCATION_FIELD(location);
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}
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static void
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_outCTESearchClause(StringInfo str, const CTESearchClause *node)
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{
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WRITE_NODE_TYPE("CTESEARCHCLAUSE");
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WRITE_NODE_FIELD(search_col_list);
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WRITE_BOOL_FIELD(search_breadth_first);
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WRITE_STRING_FIELD(search_seq_column);
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WRITE_LOCATION_FIELD(location);
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}
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static void
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_outCTECycleClause(StringInfo str, const CTECycleClause *node)
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{
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WRITE_NODE_TYPE("CTECYCLECLAUSE");
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WRITE_NODE_FIELD(cycle_col_list);
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WRITE_STRING_FIELD(cycle_mark_column);
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WRITE_NODE_FIELD(cycle_mark_value);
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WRITE_NODE_FIELD(cycle_mark_default);
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WRITE_STRING_FIELD(cycle_path_column);
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WRITE_LOCATION_FIELD(location);
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WRITE_OID_FIELD(cycle_mark_type);
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WRITE_INT_FIELD(cycle_mark_typmod);
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WRITE_OID_FIELD(cycle_mark_collation);
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WRITE_OID_FIELD(cycle_mark_neop);
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}
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static void
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_outCommonTableExpr(StringInfo str, const CommonTableExpr *node)
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{
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@ -3086,6 +3114,8 @@ _outCommonTableExpr(StringInfo str, const CommonTableExpr *node)
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WRITE_NODE_FIELD(aliascolnames);
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WRITE_ENUM_FIELD(ctematerialized, CTEMaterialize);
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WRITE_NODE_FIELD(ctequery);
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WRITE_NODE_FIELD(search_clause);
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WRITE_NODE_FIELD(cycle_clause);
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WRITE_LOCATION_FIELD(location);
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WRITE_BOOL_FIELD(cterecursive);
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WRITE_INT_FIELD(cterefcount);
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@ -4262,6 +4292,12 @@ outNode(StringInfo str, const void *obj)
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case T_WithClause:
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_outWithClause(str, obj);
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break;
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case T_CTESearchClause:
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_outCTESearchClause(str, obj);
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break;
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case T_CTECycleClause:
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_outCTECycleClause(str, obj);
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break;
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case T_CommonTableExpr:
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_outCommonTableExpr(str, obj);
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break;
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