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https://issues.apache.org/jira/browse/DRILL-5043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15679161#comment-15679161
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Nagarajan Chinnasamy commented on DRILL-5043:
---------------------------------------------
Locally, I've implemented a new function session_id as one of the
ContextFunctions and it seems to working fine in an embedded mode installation
on windows.
Following are the changes I made:
# I introduced a new function session_id() in ContextFunctions.java that
returns its output through BigIntHolder
# sessionId is a variable maintained in UserSession.java as per the following
and has a getter method:
{code}
private static final AtomicLong nextSessionId = new AtomicLong(1);
private final long sessionId;
private UserSession() {
queryCount = new AtomicInteger(0);
sessionId = nextSessionId.getAndIncrement();
}
{code}
# ContextInformation.java is modified to introduce sessionId as one of the
properties with a getter method.
# Utility.createQueryContexInformation is modified to accept sessionId as
additional argument to set the sessionId through QueryContextInformation's
builder interface. QueryContext.java, TestLocalExchange.java,
TestPartitionSender.java, TestFragmentChecker.java are modified to invoke new
Utilities.createQueryContextInformation method.
# QueryContextInformation.java is modified to set and get sessionId and to
serialize sessionId.
# BitControl.java and SchemaBitControl.java are modified to include sessionId.
I am not sure about one change I made in BitControl.java in the following block:
{code}
@@ -6934,10 +6934,15 @@ public final class BitControl {
case 26: {
bitField0_ |= 0x00000004;
defaultSchemaName_ = input.readBytes();
break;
}
+ case 36: {
+ bitField0_ |= 0x00000008;
+ sessionId_ = input.readInt64();
+ break;
+ }
{code}
I am not sure what value I should use in the "case" condition. I have randomly
put 36 there!!!!
Please review the above approach and let me know if I am in right direction.
Thanks.
> Function that returns a unique id per session/connection similar to MySQL's
> CONNECTION_ID()
> -------------------------------------------------------------------------------------------
>
> Key: DRILL-5043
> URL: https://issues.apache.org/jira/browse/DRILL-5043
> Project: Apache Drill
> Issue Type: Improvement
> Components: Functions - Drill
> Affects Versions: 1.8.0
> Reporter: Nagarajan Chinnasamy
> Priority: Minor
> Labels: CONNECTION_ID, SESSION, UDF
>
> Design and implement a function that returns a unique id per
> session/connection similar to MySQL's CONNECTION_ID().
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