CreateQuery t0 (children 3)
 Identifier t0
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration c0 (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int
 Storage definition (children 4)
  Function MergeTree (children 1)
   ExpressionList
  Function toLowCardinality (children 1)
   ExpressionList (children 1)
    Identifier c0
  Function tuple (children 1)
   ExpressionList
  Set
