Hex value of database varchar field / removing non utf-8 characters
Is there a way how to get hex value of varchar field in vertica?
This works for literal (which is a varchar, no?) :
but this doesn't for db varchar value:
select to_hex(table_name::VARBINARY) from tables
Error: Cannot cast varchar to varbinary
I was eventually able to do it using
ascii() function but that only works on 1 character. ie need to use substring and it's not flexible.
I am asking because there were some non UTF-8 bytes/characters loaded into database, and I need to know what hex value they are, as pyodbc driver is throwing errors when reading.
As a secondary question, is there a way of replacing or removing non UTF-8 characters, either before loading ( COPY command options?) or after loading (update column with some SQL functions) ?