Function _AST_MapMergeClauseReference

src/ast/ast_build_reference_map.c:384–411

Maps entities in MERGE clause. Either by implicit filters, or modified entities by SET clause.

// Maps entities in MERGE clause. Either by implicit filters, or modified entities by SET clause.
static void _AST_MapMergeClauseReference(AST *ast, const cypher_astnode_t *merge_clause) {
	// Collect implicitly filtered entities.
	const cypher_astnode_t *merge_path = cypher_ast_merge_get_pattern_path(merge_clause);
	bool force_mapping = _shouldForceMapping(merge_path);
	_AST_MapReferencedEntitiesInPath(ast, merge_path, force_mapping);

	// Map modified entities, either by ON MATCH or ON CREATE clause.
	uint merge_actions = cypher_ast_merge_nactions(merge_clause);
	for(uint i = 0; i < merge_actions; i++) {
		const cypher_astnode_t *action = cypher_ast_merge_get_action(merge_clause, i);
		cypher_astnode_type_t type = cypher_astnode_type(action);
		// ON CREATE.
		if(type == CYPHER_AST_ON_CREATE) {
			uint on_create_items = cypher_ast_on_create_nitems(action);
			for(uint j = 0; j < on_create_items; j ++) {
				const cypher_astnode_t *set_item = cypher_ast_on_create_get_item(action, j);
				_AST_MapSetItemReferences(ast, set_item);
			}
		} else if(type == CYPHER_AST_ON_MATCH) {
			// ON MATCH.
			uint on_match_items = cypher_ast_on_match_nitems(action);
			for(uint j = 0; j < on_match_items; j ++) {
				const cypher_astnode_t *set_item = cypher_ast_on_match_get_item(action, j);
				_AST_MapSetItemReferences(ast, set_item);
			}
		}
	}
}

// Map the LHS of "AS" projected entities. "WITH a as x order by x" will just collect a to the map.
static void _AST_MapWithReferredEntities(AST *ast_segment, const cypher_astnode_t *with_clause) {