{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/39827666","id":39827666,"diff_hunk":"@@ -0,0 +1,49 @@\n+// Copyright 2013 The ql Authors. All rights reserved.\n+// Use of this source code is governed by a BSD-style\n+// license that can be found in the LICENSES/QL-LICENSE file.\n+\n+// Copyright 2015 PingCAP, Inc.\n+//\n+// Licensed under the Apache License, Version 2.0 (the \"License\");\n+// you may not use this file except in compliance with the License.\n+// You may obtain a copy of the License at\n+//\n+//     http://www.apache.org/licenses/LICENSE-2.0\n+//\n+// Unless required by applicable law or agreed to in writing, software\n+// distributed under the License is distributed on an \"AS IS\" BASIS,\n+// See the License for the specific language governing permissions and\n+// limitations under the License.\n+\n+package expressions\n+\n+import (\n+\t\"github.com/juju/errors\"\n+\t\"github.com/pingcap/tidb/context\"\n+\t\"github.com/pingcap/tidb/sessionctx/db\"\n+\t\"github.com/pingcap/tidb/sessionctx/variable\"\n+)\n+\n+// See: https://dev.mysql.com/doc/refman/5.7/en/information-functions.html\n+\n+func builtinDatabase(args []interface{}, data map[interface{}]interface{}) (v interface{}, err error) {\n+\tc, ok := data[ExprEvalArgCtx]\n+\tif !ok {\n+\t\treturn nil, errors.Errorf(\"Missing ExprEvalArgCtx when evalue builtin\")\n+\t}\n+\tctx := c.(context.Context)\n+\td := db.GetCurrentSchema(ctx)\n+\tif d == \"\" {\n+\t\treturn nil, nil\n+\t}\n+\treturn d, 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