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When the `numRows` parameter stored in the table properties is
errornously set to 0 and a number of non-empty files are present
the table statistics are considered to be corrupt.
To hint that there might be a problem, the explain statement will emit
an additional warning if it detects potentially corrupt table stats like
in the following example:
Estimated Per-Host Requirements: Memory=42.00MB VCores=1
WARNING: The following tables have potentially corrupt table and/or
column statistics.
compute_stats_db.corrupted
03:AGGREGATE [FINALIZE]
| output: count:merge(*)
|
02:EXCHANGE [UNPARTITIONED]
|
01:AGGREGATE
| output: count(*)
|
00:SCAN HDFS [compute_stats_db.corrupted]
partitions=1/2 files=1 size=24B
In addition, the small query optimization is disabled for such queries.
Change-Id: I0fa911f5132aa62195b854248663a94dcd8b14de
Reviewed-on: http://gerrit.cloudera.org:8080/689
Reviewed-by: Martin Grund <mgrund@cloudera.com>
Tested-by: Internal Jenkins