[
https://issues.apache.org/jira/browse/PHOENIX-3917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16039785#comment-16039785
]
Biju Nair commented on PHOENIX-3917:
------------------------------------
Looking through the code for {{ProjectionCompiler#compile}} where the
projection size is calculated, looks the [logic to calculate the
size|https://github.com/apache/phoenix/blob/e7629ca39224e7cbc49e8a7740ed96877a16df76/phoenix-core/src/main/java/org/apache/phoenix/compile/ProjectionCompiler.java#L471-L491]
need to be moved a bit further after
{code}
if (isWildcard) {
projectAllColumnFamilies(table, scan);
} else {
isProjectEmptyKeyValue = where == null ||
LiteralExpression.isTrue(where) || where.requiresFinalEvaluation();
for (byte[] family : projectedFamilies) {
projectColumnFamily(table, scan, family);
}
}
{code}
Also if the column projected in the query is only the key column, the size of
the key column need to be set to the estimated size of the {{RowProjector}}.
After making the changes the size returned are 4 and 72 respectively for the
queries mentioned in the description of this issue where both the columns
{{A_ID}} and {{A_DATA}} are of the {{int}}. If this fix is correct let me know
and I can provide a patch.
> RowProjector#getEstimatedRowByteSize() returns incorrect value
> --------------------------------------------------------------
>
> Key: PHOENIX-3917
> URL: https://issues.apache.org/jira/browse/PHOENIX-3917
> Project: Phoenix
> Issue Type: Bug
> Reporter: Biju Nair
> Priority: Minor
>
> {{queryPlan..getProjector().getEstimatedRowByteSize()}} returns "0" for a
> query {{SELECT A_ID FROM TABLE}} where {{A_ID}} is Primary Key. Same is the
> case for the query {{SELECT A_ID, A_DATA FROM TABLE}} where {{A_DATA}} is a
> non key column. Assuming that the method is meant to return the estimated
> number of bytes from the query projection the returned value of 0 is
> incorrect.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
