Function _rewrite_call_subquery_clause

src/ast/ast_rewrite_call_subquery.c:455–485

rewrites the subquery to contain the projections needed in case of an eager and returning execution-plan such that bound vars will remain in the record when passed to the CallSubquery op returns true if the subquery was rewritten

// remain in the record when passed to the CallSubquery op
// returns true if the subquery was rewritten
static bool _rewrite_call_subquery_clause
(
	cypher_astnode_t *wrapping_clause,  // outer-context clause (query/call {})
	uint clause_idx,                    // index of the call {} clause in query
	uint start,                         // start ind from which to collect bound vars
	char ***inter_names                 // internal representation of bound vars
) {
	ASSERT(cypher_astnode_type(wrapping_clause) == CYPHER_AST_QUERY);

	cypher_astnode_t *clause = (cypher_astnode_t *)
		cypher_ast_query_get_clause(wrapping_clause, clause_idx);
	ASSERT(cypher_astnode_type(clause) == CYPHER_AST_CALL_SUBQUERY);

	cypher_astnode_t *subquery = cypher_ast_call_subquery_get_query(clause);
	uint subclauses_count = cypher_ast_query_nclauses(subquery);

	// check if the subquery will result in an eager and returning
	// execution-plan
	const cypher_astnode_t *last_clause =
		cypher_ast_query_get_clause(subquery, subclauses_count - 1);
	bool is_returning = cypher_astnode_type(last_clause) == CYPHER_AST_RETURN;

	bool is_eager = AST_IsEager(subquery);

	if(is_eager && is_returning) {
		_rewrite_projections(wrapping_clause, clause_idx, start, inter_names);
		return true;
	}

	return false;
}

// restores `outer_names` to its original size by freeing the added components
static void _restore_outer_internal_names