CreateQuery tab (children 3)
 Identifier tab
 Columns definition (children 2)
  ExpressionList (children 3)
   ColumnDeclaration uint64 (children 1)
    DataType UInt64
   ColumnDeclaration int32 (children 2)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int32
    Literal \'example comment\'
   ColumnDeclaration str (children 1)
    DataType String
  ExpressionList (children 1)
   Index (children 2)
    Identifier str
    Function set (children 1)
     ExpressionList (children 1)
      Literal UInt64_1000
 Storage definition (children 3)
  Function MergeTree
  Identifier uint64
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier uint64
    Identifier str
