Runkang He created CALCITE-6065:
-----------------------------------

             Summary: Add HEX and UNHEX function (enabled in Hive and Spark 
library)
                 Key: CALCITE-6065
                 URL: https://issues.apache.org/jira/browse/CALCITE-6065
             Project: Calcite
          Issue Type: New Feature
          Components: core
    Affects Versions: 1.35.0
            Reporter: Runkang He


Add HEX and UNHEX function (enabled in Hive and Spark library)
- HEX: Converts a BIGINT/CHARACTER/BINARY into a hexadecimal CHARACTER.
- UNHEX: Converts a hexadecimal-encoded CHARACTER into BINARY format.
See more about HEX in 
[Hive|https://cwiki.apache.org/confluence/display/hive/languagemanual+udf#LanguageManualUDF-MathematicalFunctions]
 and [Spark|https://spark.apache.org/docs/latest/api/sql/index.html#hex] doc, 
and UNHEX in 
[Hive|https://cwiki.apache.org/confluence/display/hive/languagemanual+udf#LanguageManualUDF-MathematicalFunctions]
 and [Spark|https://spark.apache.org/docs/latest/api/sql/index.html#unhex] doc.



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