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https://issues.apache.org/jira/browse/HAWQ-403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143655#comment-15143655
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Karthikeyan Jambu Rajaraman commented on HAWQ-403:
--------------------------------------------------
Issue is fixed and pushed to Hawq master and 1.3
> Nested decode fails when inner decode return null
> -------------------------------------------------
>
> Key: HAWQ-403
> URL: https://issues.apache.org/jira/browse/HAWQ-403
> Project: Apache HAWQ
> Issue Type: Bug
> Components: Query Execution
> Reporter: Karthikeyan Jambu Rajaraman
> Assignee: George Caragea
>
> Nested decode fails when inner decode return null.
> E.g.
> ---
> --- Drop existing table
> ---
> DROP TABLE IF EXISTS t;
> ---
> --- Create new table t
> ---
> CREATE TABLE t(pid INT, wid INT, state CHARACTER VARYING(30));
> ---
> --- Insert a row and keep state as empty
> ---
> INSERT INTO t VALUES(1, 1);
> ---
> --- use nested decode
> ---
> SELECT DECODE(DECODE(state, '', NULL, state), '-', NULL, state) AS state FROM
> t;
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