CreateQuery tab (children 3)
 Identifier tab
 Columns definition (children 2)
  ExpressionList (children 1)
   ColumnDeclaration col (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Boolean
  ExpressionList (children 1)
   Index (children 2)
    Identifier col
    Function set (children 1)
     ExpressionList (children 1)
      Literal UInt64_0
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
