Philip Zeyliger created IMPALA-6616:
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Summary: UUIDs for query id's never seem to start with 0
Key: IMPALA-6616
URL: https://issues.apache.org/jira/browse/IMPALA-6616
Project: IMPALA
Issue Type: Bug
Reporter: Philip Zeyliger
In working with a bucket of Impala profiles, I was surprised to find that I had
no queries whose ID began with "0". I would have expected the id space to be
uniformly distributed.
Here's a simple reproduction where I run 200 queries and find that none of them
had a query id that began with 0.
{code}
$(for i in $(seq 20); do impala-shell.sh --query 'select 1;select 2;select
3;select 4;select 5;select 6;select 7; select 8; select 9;select 10;' |& grep
-o 'query_id=.*' | awk -F= '{ print $2 }' | cut -c 1; done) | sort | uniq -c
12 1
8 2
14 3
10 4
17 5
17 6
12 7
13 8
12 9
7 a
14 b
18 c
11 d
20 e
15 f
{code}
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