CreateQuery bug_14144 (children 3)
 Identifier bug_14144
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration meta_source_req_uuid (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UUID
   ColumnDeclaration a (children 1)
    DataType Int64
   ColumnDeclaration meta_source_type (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Identifier a