Regarding item 2 & 3, IIKC, there is no upper limit of IN clause. An
IN-list predicate could be converted to a JOIN between T1 and VALUES
operator, when the number of values in IN-LIST is beyond certain
threshold. An Aggregate operator is applied to remove possible
duplicates values in the list. That's why you may see HashAgg in the
query plan.
If the number of values in IN-list is under the threshold, IN-list is
evaluated as a OR-ed predicates.
The default threshold is 20 [1]. But you can change it, by running following:
alter session set `planner.in_subquery_threshold` = some_number;
>From T1
WHERE T1.expression in (value1, value2, ..., value_n)?
==>
Join
/ \
T1 Agg
\
Values (values1, values2, ..., values_n)
[1]
https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java#L99-L100
On Mon, Feb 6, 2017 at 9:16 PM, <jasbir.s...@accenture.com> wrote:
> Hi,
>
> I am interested in joining this session.
>
> My area of interest would be -
>
> 1. Future roadmap of Apache Drill
> 2. How apache drill creates HashAgg when there are lot of IN members in a
> where clause
> 3. What is the upper limit of IN CLAUSE.
>
> Regards,
> Jasbir Singh
>
> -----Original Message-----
> From: Jinfeng Ni [mailto:j...@apache.org]
> Sent: Tuesday, February 07, 2017 1:19 AM
> To: dev <d...@drill.apache.org>; user <user@drill.apache.org>
> Subject: Drill Hangout 2/7/2017
>
> Hi drillers,
>
> We are going to have Drill Hangout tomorrow (02/07/2017, 10 AM PT). If you
> have any suggestions for hangout topics, you can add them to this thread. We
> will also ask around at the beginning of the hangout for topics.
>
> Thank you,
>
> Jinfeng
>
> ________________________________
>
> This message is for the designated recipient only and may contain privileged,
> proprietary, or otherwise confidential information. If you have received it
> in error, please notify the sender immediately and delete the original. Any
> other use of the e-mail by you is prohibited. Where allowed by local law,
> electronic communications with Accenture and its affiliates, including e-mail
> and instant messaging (including content), may be scanned by our systems for
> the purposes of information security and assessment of internal compliance
> with Accenture policy.
> ______________________________________________________________________________________
>
> www.accenture.com
