CreateQuery bug_table (children 3)
 Identifier bug_table
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration date_column (children 1)
    DataType Date
   ColumnDeclaration c1 (children 1)
    DataType String
   ColumnDeclaration c2 (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Identifier date_column
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier c1
    Identifier c2
