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From Chunhui Liu <leeyc...@gmail.com>
Subject SELECT failed on secondary index when table's columns are ALL primary key
Date Wed, 14 Oct 2015 06:04:05 GMT
Hi Team,

Recently, When I try to learn paged query on table with secondary index, I
got this.

1. create a table, and use all columns(eg. pk1, pk2) as constraint pk;
2. create a secondary index on the table, use (pk2, pk1) as constraint pk;
3. create some test data;
4. select pk1, pk2 from t where pk2='202';
5. no result;

Test on
phoenix4.5.2-hbase-0.98, cdh 5.3.6

-----------------------------------------------------------------

--Create table, all columns are primary key.
CREATE TABLE IF NOT EXISTS T (
   PK1 VARCHAR not null,
   PK2 VARCHAR not null,
   CONSTRAINT PK PRIMARY KEY (PK1, PK2)
);

--Create secondary index
CREATE INDEX IDX_T ON T
(
   PK2, PK1
);

--Test data
UPSERT INTO T VALUES('100', '200');
UPSERT INTO T VALUES('101', '201');
UPSERT INTO T VALUES('102', '202');
UPSERT INTO T VALUES('103', '203');
UPSERT INTO T VALUES('104', '204');

--make sure data was created correctly.
SELECT * FROM T;

--success
SELECT PK1, PK2 FROM T WHERE PK1='102';

--*no result* with conditions(pk2[=,>,<,>=,<=]'202')
EXPLAIN
SELECT PK1, PK2 FROM T WHERE PK2 = '202';

--success
EXPLAIN
SELECT /*+ NO_INDEX*/ PK1, PK2 FROM T WHERE PK2 = '202';

--cleanup
DROP TABLE IF EXISTS T;

-----------------------------------------------------------------

*Then*, I create a table with extra column(KV), SELECT is ok.

-----------------------------------------------------------------
CREATE TABLE IF NOT EXISTS T (
   PK1 VARCHAR not null,
   PK2 VARCHAR not null,
   KV  VARCHAR,
   CONSTRAINT PK PRIMARY KEY (PK1, PK2)
);

--Create secondary index
CREATE INDEX IDX_T ON T
(
   PK2, PK1
);
-----------------------------------------------------------------

Is this a bug?

Chunhui,
Thanks.

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