validate_utf8 function

Applies to: check marked yes Databricks Runtime 15.4 and later

Returns the input value if it corresponds to a valid UTF-8 string, or raises INVALID_UTF8_STRING otherwise.

Syntax 

validate_utf8(strExpr)

Arguments

  • strExpr: A STRING expression.

Returns

A STRING which is byte-wise equal to strExpr in case it represents a valid UTF-8 string, or raises INVALID_UTF8_STRING otherwise.

To return NULL if the input is not a valid UTF-8 string, use the try_validate_utf8 function.

Examples 

– Simple example taking a valid string as input.
> SELECT validate_utf8('Spark')
  Spark

– Simple example taking a valid collated string as input.
> SELECT validate_utf8('SQL' COLLATE UTF8_LCASE)
  SQL

– Simple example taking a valid hexadecimal string as input.
> SELECT validate_utf8(x'61')
  a

– Example taking an invalid hexadecimal string as input (illegal UTF-8 byte sequence).
> SELECT validate_utf8(x'80')
  [INVALID_UTF8_STRING] Invalid UTF8 byte sequence found in string: \x80.