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Microbenchmarks to test parallel workers scaling performance #117

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Report with the query plan details for YB colocated tables.

- name: join_on_pk_3tbl
weight: 100
queries:
- query: /*+ set(max_parallel_workers_per_gather 8) */ select count(*) from pkeyBigint1M_1 as a join pkeyBigint1M_2 as b on a.col_bigint_card1_1=b.col_bigint_card1_1 and a.col_bigint_card3_1=b.col_bigint_card3_1 where b.col_bigint_card1_1>1000000 and b.col_bigint_card2_1 >1000000;

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Right now the query is running for 26 seconds. Do we want to reduce the time of the query to say 2-3 seconds. This will ensure that the query is run multiple times. Right now, the query is being run only 4-10 times

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