CreateQuery Test (children 3)
 Identifier Test
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration impression_id (children 1)
    DataType String
   ColumnDeclaration impression_id_compressed (children 2)
    DataType FixedString (children 1)
     ExpressionList (children 1)
      Literal UInt64_16
    Function UUIDStringToNum (children 1)
     ExpressionList (children 1)
      Function substring (children 1)
       ExpressionList (children 3)
        Identifier impression_id
        Literal UInt64_1
        Literal UInt64_36
   ColumnDeclaration impression_id_hashed (children 2)
    DataType UInt16
    Function reinterpretAsUInt16 (children 1)
     ExpressionList (children 1)
      Identifier impression_id_compressed
   ColumnDeclaration event_date (children 1)
    DataType Date
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 4)
    Identifier event_date
    Identifier impression_id_hashed
    Function tuple (children 1)
     ExpressionList (children 2)
      Identifier event_date
      Identifier impression_id_hashed
    Literal UInt64_8192
