Function isCTERef

backend/plugin/parser/tidb/backup.go:423–425

isCTERef reports whether ref resolves to a CTE. A CTE reference is always unqualified, so a schema-qualified physical table (db.test) is never a CTE even if its name matches one. CTE names match case-insensitively (TiDB resolves a case-mismatched reference to the CTE, which shadows a same-named real

(cteNames map[string]bool, ref *TableReference)

// resolves a case-mismatched reference to the CTE, which shadows a same-named
// real table), consistent with the file's other identifier comparisons.
func isCTERef(cteNames map[string]bool, ref *TableReference) bool {
	return !ref.ExplicitSchema && cteNames[strings.ToLower(ref.Table)]
}

// writeCTEPrefix writes the statement's WITH (CTE) clause before the backup
// SELECT, so a SELECT whose FROM references a CTE stays valid. omni does not