Dylan He created FLINK-35993:
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Summary: Add UNHEX function
Key: FLINK-35993
URL: https://issues.apache.org/jira/browse/FLINK-35993
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API
Reporter: Dylan He
Add UNHEX function.
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Converts hexadecimal {{expr}} to BINARY.
Example:
{code:sql}
> SELECT DECODE(UNHEX('466C696E6B'), 'UTF-8');
Flink
{code}
Syntax:
{code:sql}
UNHEX(expr)
{code}
Arguments:
* {{expr}}: A STRING expression of hexadecimal characters.
Returns:
A BINARY.
If the length of {{expr}} is odd, the first character is discarded and the
result is padded with a null byte. If {{expr}} contains non hex characters the
result is NULL.
See also:
*
[Spark|https://spark.apache.org/docs/3.5.1/sql-ref-functions-builtin.html#mathematical-functions]
*
[Databricks|https://docs.databricks.com/en/sql/language-manual/functions/unhex.html]
*
[MySQL|https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_unhex]
* [PostgreSQL|https://www.postgresql.org/docs/16/functions-binarystring.html]
decode(expr, 'hex')
*
[Snowflake|https://docs.snowflake.com/en/sql-reference/functions/hex_decode_binary]
* [Calcite|https://calcite.apache.org/docs/reference.html] from_hex
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