[IMPALA-2136] Partitions with TINYINT partition columns will always have 0 estimated rows after compute stats

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 2.2
• Fix Version/s: Impala 2.3.0
• Target Version: Impala 2.3.0
• Assignee: Henry Robinson
• Reporter: Henry Robinson
• Created: 14/Jul/15 20:47
• Updated: 16/Jul/15 01:06
• Resolved: 16/Jul/15 01:06

Description

If a table has a TINYINT partition column, COMPUTE STATS will always set the number of rows for all partitions to be 0 (the table-wide row count remains accurate).

This is because a bug in PrintVal() in hs2-util.cc does not correctly cast 8-bit values to integers, causing stringstream::operator<< to interpret them as characters and printing an ASCII character rather than a string representation of an integer.