Details
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Bug
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Status: Closed
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Major
-
Resolution: Fixed
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1.6.0
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None
Description
This problem was initially reported by Shankar Mane <shankar.mane@games24x7.com>
> Problem:
>
> 1. In drill, we are using hive partition table. But explain plan (same
> query) for like and = operator differs and used all partitions in case of
> like operator.
> 2. If you see below drill explain plans: Like operator uses all
> partitions where
> = operator uses only partition filtered by log_date condition.
I reproduced the reported issue. I have a partitioned hive external table with the following schema:
create external table if not exists lineitem_partitioned (
l_orderkey bigint,
l_partkey bigint,
l_suppkey bigint,
l_linenumber bigint,
l_quantity double,
l_extendedprice double,
l_discount double,
l_tax double,
l_returnflag string,
l_linestatus string,
l_shipdate string,
l_commitdate string,
l_receiptdate string,
l_shipinstruct string,
l_shipmode string,
l_comment string
)
partitioned by (year int, month int, day int)
STORED AS PARQUET
LOCATION '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem';
alter table lineitem_partitioned add partition(year=2015, month=1, day=1) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/1';
alter table lineitem_partitioned add partition(year=2015, month=1, day=2) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/2';
alter table lineitem_partitioned add partition(year=2015, month=1, day=3) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/3';
alter table lineitem_partitioned add partition(year=2015, month=1, day=4) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/4';
alter table lineitem_partitioned add partition(year=2015, month=1, day=5) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/5';
alter table lineitem_partitioned add partition(year=2015, month=1, day=6) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/6';
alter table lineitem_partitioned add partition(year=2015, month=1, day=7) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/7';
alter table lineitem_partitioned add partition(year=2015, month=1, day=8) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/8';
alter table lineitem_partitioned add partition(year=2015, month=1, day=9) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/9';
alter table lineitem_partitioned add partition(year=2015, month=1, day=10) location '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/10';
Without 'LIKE', drill plans right:
0: jdbc:drill:schema=dfs.drillTestDir> explain plan for select l_shipdate, l_linestatus, l_shipinstruct, `day` from lineitem_partitioned_db2k_2_999 where `day` = 2 limit 10; +------+------+ | text | json | +------+------+ | 00-00 Screen 00-01 Project(l_shipdate=[$0], l_linestatus=[$1], l_shipinstruct=[$2], day=[$3]) 00-02 SelectionVectorRemover 00-03 Limit(fetch=[10]) 00-04 Limit(fetch=[10]) 00-05 Project(l_shipdate=[$1], l_linestatus=[$0], l_shipinstruct=[$2], day=[$3]) 00-06 Scan(groupscan=[HiveScan [table=Table(dbName:md815_db2k, tableName:lineitem_partitioned_db2k_2_999), columns=[`l_linestatus`, `l_shipdate`, `l_shipinstruct`, `day`], numPartitions=1, partitions= [Partition(values:[2015, 1, 2])], inputDirectories=[maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/2]]])
With 'LIKE', pruning is not happening:
0: jdbc:drill:schema=dfs.drillTestDir> explain plan for select l_shipdate, l_linestatus, l_shipinstruct, `day` from lineitem_partitioned_db2k_2_999 where `day` = 2 and l_shipinstruct like '%BACK%' limit 10; +------+------+ | text | json | +------+------+ | 00-00 Screen 00-01 Project(l_shipdate=[$0], l_linestatus=[$1], l_shipinstruct=[$2], day=[$3]) 00-02 SelectionVectorRemover 00-03 Limit(fetch=[10]) 00-04 Limit(fetch=[10]) 00-05 Project(l_shipdate=[$1], l_linestatus=[$0], l_shipinstruct=[$2], day=[$3]) 00-06 SelectionVectorRemover 00-07 Filter(condition=[AND(=($3, 2), LIKE($2, '%BACK%'))]) 00-08 Scan(groupscan=[HiveScan [table=Table(dbName:md815_db2k, tableName:lineitem_partitioned_db2k_2_999), columns=[`l_linestatus`, `l_shipdate`, `l_shipinstruct`, `day`], numPartitions=10, partitions= [Partition(values:[2015, 1, 1]), Partition(values:[2015, 1, 10]), Partition(values:[2015, 1, 2]), Partition(values:[2015, 1, 3]), Partition(values:[2015, 1, 4]), Partition(values:[2015, 1, 5]), Partition(values:[2015, 1, 6]), Partition(values:[2015, 1, 7]), Partition(values:[2015, 1, 8]), Partition(values:[2015, 1, 9])], inputDirectories=[maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/1, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/10, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/2, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/3, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/4, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/5, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/6, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/7, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/8, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/9]]])
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