Function _ValidateMultiHopTraversal

src/ast/ast_validations.c:186–211

make sure multi-hop traversals has length greater than or equal to zero

// make sure multi-hop traversals has length greater than or equal to zero
static AST_Validation _ValidateMultiHopTraversal
(
	const cypher_astnode_t *edge,  // ast-node to validate
	const cypher_astnode_t *range  // varlength range
) {
	int start = 1;
	int end = INT_MAX - 2;

	const cypher_astnode_t *range_start = cypher_ast_range_get_start(range);
	if(range_start) {
		start = AST_ParseIntegerNode(range_start);
	}

	const cypher_astnode_t *range_end = cypher_ast_range_get_end(range);
	if(range_end) {
		end = AST_ParseIntegerNode(range_end);
	}

	// Validate specified range
	if(start > end) {
		ErrorCtx_SetError("Variable length path, maximum number of hops must be greater or equal to minimum number of hops.");
		return AST_INVALID;
	}
	
	return AST_VALID;
}

// Verify that MERGE doesn't redeclare bound relations, that one reltype is specified for unbound relations, 
// and that the entity is not a variable length pattern