CreateQuery test_tolowcardinality_where (children 3)
 Identifier test_tolowcardinality_where
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt32
   ColumnDeclaration val (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier id
