CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration pt (children 1)
    DataType String
   ColumnDeclaration count_distinct_exposure_uv (children 1)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier uniqHLL12
      DataType Int64
 Storage definition (children 2)
  Function AggregatingMergeTree
  Identifier pt
