Function _add_projections

src/ast/ast_rewrite_call_subquery.c:78–117

add projections to projections array, corresponding to the bound vars (names) and their internal representation (inter_names) if `direction` is 0 (false), projections from `names` to `inter_names` are added. if `directions` is 1, projections from `inter_names` to `names` are added. if `directions` is 2, projections from `inter_names` to `inter_names` are added. returns the new value of `proj_idx`

// added.
// returns the new value of `proj_idx`
static uint _add_projections
(
	cypher_astnode_t *projections[],  // array of projections
	uint proj_idx,                    // index to start adding projections
	char **names,                     // bound vars
	char **inter_names,               // internal representation of bound vars
	bool hide                         // hide or reveal vars
) {
	uint n_names = array_len(names);
	uint n_inter_names = array_len(inter_names);
	uint n_outer_names = n_inter_names - n_names;

	if(hide) {
		proj_idx = _add_names_projections(projections, proj_idx, names,
			inter_names + n_outer_names, hide);
	} else {
		proj_idx = _add_names_projections(projections, proj_idx,
			inter_names + n_outer_names, names, hide);
	}

	// -------------------------------------------------------------------------
	// create projections for bound vars from outer context
	// -------------------------------------------------------------------------
	for(uint i = 0; i < n_outer_names; i++) {
		// create a projection for the bound var
		struct cypher_input_range range = {0};
		cypher_astnode_t *exp = cypher_ast_identifier(inter_names[i],
			strlen(inter_names[i]), range);
		cypher_astnode_t *alias = cypher_ast_identifier(inter_names[i],
			strlen(inter_names[i]), range);
		cypher_astnode_t *children[2];
		children[0] = exp;
		children[1] = alias;

		projections[proj_idx++] = cypher_ast_projection(exp, alias, children,
			2, range);
	}

	return proj_idx;
}

// replaces a `WITH` clause, placed in clause_idx within `callsubquery`, with a
// new `WITH` clause containing projections of `names` to `inter_names`