CreateQuery t_group_by_lowcardinality (children 3)
 Identifier t_group_by_lowcardinality
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration p_date (children 1)
    DataType Date
   ColumnDeclaration val (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier p_date
  Function tuple (children 1)
   ExpressionList