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https://issues.apache.org/jira/browse/PHOENIX-7238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hari Krishna Dara updated PHOENIX-7238:
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Summary: Queries that use an uncovered index with SALT_BUCKETS=0, we get /0
error (was: Zero is accepted for SALT_BUCKETS, but queries fail)
> Queries that use an uncovered index with SALT_BUCKETS=0, we get /0 error
> ------------------------------------------------------------------------
>
> Key: PHOENIX-7238
> URL: https://issues.apache.org/jira/browse/PHOENIX-7238
> Project: Phoenix
> Issue Type: Bug
> Reporter: Hari Krishna Dara
> Priority: Minor
>
> I have not done extensive testing on it, but when I specified
> {{SALT_BUCKETS=0}} while creating an index, I get no error and this is a
> valid use case to disable salting on index when the data table is salted:
> {{create table tsalt (k INTEGER PRIMARY KEY, v1 INTEGER) SALT_BUCKETS=4;}}
> {{upsert into tsalt (k, v1) VALUES (1, 100);}}
> {{create uncovered index tsaltidx on tsalt (PHOENIX_ROW_TIMESTAMP())
> SALT_BUCKETS=0;}}
>
> From schema and hbase regions, it is correctly treated as no salting scenario.
>
> {{0: jdbc:phoenix:localhost> select salt_buckets from system.catalog where
> table_name = 'TSALTIDX' and salt_buckets is not null;}}
> +--------------+
> | SALT_BUCKETS |
> +--------------+
> +--------------+
> No rows selected (0.026 seconds)
>
> {{hbase:001:0> list_regions 'TSALTIDX'}}
> {{ SERVER_NAME |
> REGION_NAME | START_KEY | END_KEY | SIZE | REQ | LOCALITY |}}
> {{ ----------------------------- |
> --------------------------------------------------------- | ---------- |
> ---------- | ----- | ----- | ---------- |}}
> {{ localhost,16020,1708958003582 |
> TSALTIDX,,1708958225506.a72b20c15cecba23289a03cd6956ec15. | |
> | 0 | 3 | 0.0 |}}
> {{ 1 rows}}
> However, when I query through the index, I get an {{ArithmeticError}} for
> divide by zero.
> {{{{{}0: jdbc:phoenix:localhost> select /*+ INDEX(TSALT TSALTIDX) */ * from
> TSALT;{}}}{{{}Caused by: java.lang.ArithmeticException: / by zero{}}}
> {{ at
> org.apache.phoenix.schema.SaltingUtil.getSaltingByte(SaltingUtil.java:79)}}
> {{ at
> org.apache.phoenix.index.IndexMaintainer.buildDataRowKey(IndexMaintainer.java:916)}}
> {{ at
> org.apache.phoenix.coprocessor.UncoveredIndexRegionScanner.scanIndexTableRows(UncoveredIndexRegionScanner.java:253)}}
> {{ at
> org.apache.phoenix.coprocessor.UncoveredIndexRegionScanner.scanIndexTableRows(UncoveredIndexRegionScanner.java:274)}}
> {{ at
> org.apache.phoenix.coprocessor.UncoveredIndexRegionScanner.next(UncoveredIndexRegionScanner.java:382)}}
> {{ at
> org.apache.phoenix.coprocessor.BaseRegionScanner.nextRaw(BaseRegionScanner.java:56)}}
> {{ at
> org.apache.phoenix.iterate.RegionScannerFactory$1.nextRaw(RegionScannerFactory.java:257)}}
> My suspicion is that table cells have number buckets stored as zero, so
> PTableImpl for the index gets constructed to return 0 from {{getBucketNum()}}
> and this is causing the divide by 0 error.
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