[ 
https://issues.apache.org/jira/browse/CALCITE-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ritesh updated CALCITE-3648:
----------------------------
    Description: 
[https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_uncompress]

e.g.:
{code:java}
SELECT UNCOMPRESS(COMPRESS('any string'));
        -> 'any string'
SELECT UNCOMPRESS('any string');
        -> NULL
{code}
Uncompresses a string compressed by the 
[{{COMPRESS()}}|https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_compress]
 function. If the argument is not a compressed value, the result is {{NULL}}. 
This function uses zlib library for decompression 
[(https://docs.oracle.com/javase/8/docs/api/java/util/zip/Inflater.html|https://docs.oracle.com/javase/8/docs/api/java/util/zip/Inflater.html]).
 Otherwise, the return value is always {{NULL}}.

  was:
[https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_uncompress]

e.g.:
{code:java}
SELECT UNCOMPRESS(COMPRESS('any string'));
        -> 'any string'
SELECT UNCOMPRESS('any string');
        -> NULL
{code}

Uncompresses a string compressed by the 
[{{COMPRESS()}}|https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_compress]
 function. If the argument is not a compressed value, the result is {{NULL}}. 
This function uses zlib library for decompression (

https://docs.oracle.com/javase/8/docs/api/java/util/zip/Inflater.html)

. Otherwise, the return value is always {{NULL}}.


> MySQL UNCOMPRESS function support
> ---------------------------------
>
>                 Key: CALCITE-3648
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3648
>             Project: Calcite
>          Issue Type: Sub-task
>            Reporter: Ritesh
>            Assignee: Ritesh
>            Priority: Major
>
> [https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_uncompress]
> e.g.:
> {code:java}
> SELECT UNCOMPRESS(COMPRESS('any string'));
>         -> 'any string'
> SELECT UNCOMPRESS('any string');
>         -> NULL
> {code}
> Uncompresses a string compressed by the 
> [{{COMPRESS()}}|https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_compress]
>  function. If the argument is not a compressed value, the result is {{NULL}}. 
> This function uses zlib library for decompression 
> [(https://docs.oracle.com/javase/8/docs/api/java/util/zip/Inflater.html|https://docs.oracle.com/javase/8/docs/api/java/util/zip/Inflater.html]).
>  Otherwise, the return value is always {{NULL}}.



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