Function AST_RewriteStarProjections

src/ast/ast_rewrite_star_projections.c:293–337

}

bool AST_RewriteStarProjections
(
	const cypher_astnode_t *root  // root for which to rewrite star projections
) {
	bool rewritten = false;

	if(cypher_astnode_type(root) != CYPHER_AST_QUERY) {
		return false;
	}

	// rewrite all WITH * / RETURN * clauses to include all aliases
	uint scope_start  = 0;
	uint clause_count = cypher_ast_query_nclauses(root);

	for(uint i = 0; i < clause_count; i ++) {
		const cypher_astnode_t *clause = cypher_ast_query_get_clause(root, i);
		cypher_astnode_type_t t = cypher_astnode_type(clause);

		if(t == CYPHER_AST_CALL_SUBQUERY) {
			rewritten |=
				_rewrite_call_subquery_star_projections(root, scope_start, i);
			continue;
		}

		if(t != CYPHER_AST_WITH && t != CYPHER_AST_RETURN) {
			continue;
		}

		bool has_include_existing = (t == CYPHER_AST_WITH) ?
									cypher_ast_with_has_include_existing(clause) :
									cypher_ast_return_has_include_existing(clause);

		if(has_include_existing) {
			// clause contains a star projection, replace it
			replace_clause((cypher_astnode_t *)root, (cypher_astnode_t *)clause,
						   scope_start, i, NULL);
			rewritten = true;
		}

		// update scope start
		scope_start = i;
	}

	return rewritten;
}