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A UNION is special because it may cause a scan node to be started without any scan ranges. The Kudu scanner didn't expect that scenario and would hang waiting for data from scanner threads that would never be started. The fix is to exit early when there are no scan ranges. Change-Id: Id53fb880ba23ee9bbcf3169598f97fa1a3285dd9 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/10044 Reviewed-by: Casey Ching <casey@cloudera.com> Tested-by: jenkins
64 lines
2.2 KiB
Plaintext
64 lines
2.2 KiB
Plaintext
====
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---- QUERY
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# Make sure LIMIT is enforced.
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select * from dimtbl order by id limit 1;
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---- RESULTS
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1001,'Name1',94611
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---- TYPES
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BIGINT, STRING, INT
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====
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---- QUERY
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# Make sure that we can list the columns to be scanned in any order, that predicates
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# work and that we can have predicates on columns not referenced elsewhere.
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select zip, id from dimtbl where id >= 1000 and 1002 >= id and 94611 = zip and
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'Name1' = name order by id;
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---- RESULTS
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94611,1001
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---- TYPES
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INT, BIGINT
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====
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---- QUERY
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# Regression test for IMPALA-2740, a NULL value from a previously filtered row would
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# carry over into the next unfiltered row (the result below would incorrectly be 2,NULL).
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USE kududb_test;
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CREATE TABLE impala_2740 (key INT, value INT)
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TBLPROPERTIES(
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'storage_handler' = 'com.cloudera.kudu.hive.KuduStorageHandler',
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'kudu.table_name' = 'impala_2740',
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'kudu.master_addresses' = '127.0.0.1',
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'kudu.key_columns' = 'key');
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INSERT INTO impala_2740 VALUES (1, NULL), (2, -2);
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SELECT * FROM impala_2740 WHERE key != 1;
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---- RESULTS
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2,-2
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---- TYPES
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INT, INT
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====
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---- QUERY
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# Regression test for IMPALA-2635, the Kudu scanner hangs waiting for data from scanner
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# threads that are never started. The union and both scans land in the same fragment which
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# is run on all impalads. However, for the t1 table there is only as single scan range,
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# so two of the scan instances get empty scan ranges.
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CREATE TABLE impala_2635_t1 (id BIGINT, name STRING)
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TBLPROPERTIES(
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'storage_handler' = 'com.cloudera.kudu.hive.KuduStorageHandler',
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'kudu.table_name' = 'impala_2635_t1',
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'kudu.master_addresses' = '127.0.0.1',
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'kudu.key_columns' = 'id');
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CREATE TABLE impala_2635_t2 (id BIGINT, name STRING)
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DISTRIBUTE BY HASH(id) INTO 16 BUCKETS
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TBLPROPERTIES(
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'storage_handler' = 'com.cloudera.kudu.hive.KuduStorageHandler',
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'kudu.table_name' = 'impala_2635_t2',
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'kudu.master_addresses' = '127.0.0.1',
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'kudu.key_columns' = 'id');
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INSERT INTO impala_2635_t1 VALUES (0, 'Foo');
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INSERT INTO impala_2635_t2 VALUES (1, 'Blah');
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SELECT * FROM impala_2635_t1 UNION ALL SELECT * FROM impala_2635_t2;
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---- RESULTS
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0,'Foo'
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1,'Blah'
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---- TYPES
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BIGINT, STRING
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====
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