Function _AST_Extract_Params

src/ast/ast.c:91–131

this method extracts the query's parameters values, convert them into constant SIValues and store them in a map of in the query context

// constant SIValues and store them in a map of <name, value>
// in the query context
static void _AST_Extract_Params
(
	const cypher_parse_result_t *parse_result
) {
	// retrieve the AST root node from a parsed query
	const cypher_astnode_t *statement = _AST_parse_result_root(parse_result);
	uint noptions = cypher_ast_statement_noptions(statement);
	if(noptions == 0) {
		return;
	}

	rax *params = raxNew();
	for(uint i = 0; i < noptions; i++) {
		const cypher_astnode_t *option =
			cypher_ast_statement_get_option(statement, i);
		uint nparams = cypher_ast_cypher_option_nparams(option);

		for(uint j = 0; j < nparams; j++) {
			const cypher_astnode_t *param =
				cypher_ast_cypher_option_get_param(option, j);

			const char *paramName =
				cypher_ast_string_get_value(
						cypher_ast_cypher_option_param_get_name(param));

			const cypher_astnode_t *paramValue =
				cypher_ast_cypher_option_param_get_value(param);

			AR_ExpNode *exp = AR_EXP_FromASTNode(paramValue);
			SIValue *v = rm_malloc(sizeof(SIValue));
			SIValue _v = AR_EXP_Evaluate(exp, NULL);
			*v = SI_CloneValue(_v);
			raxInsert(params, (unsigned char *)paramName, strlen(paramName),
					(void *)v, NULL);
			AR_EXP_Free(exp);
		}
	}

	// add the parameters map to the QueryCtx
	QueryCtx_SetParams(params);
}

static void AST_IncreaseRefCount
(