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  1. IMPALA
  2. IMPALA-2446

Incorrect result (left join)

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      Description

      Query:

      SELECT t3976.field_13, t3977.pos
      FROM table_0 t3976
      LEFT JOIN t3976.field_0.field_5 t3977
      WHERE (t3976.field_13) = (t3977.pos)
      

      Plan:

      +------------------------------------------------------------------------------------+
      | Explain String                                                                     |
      +------------------------------------------------------------------------------------+
      | Estimated Per-Host Requirements: Memory=96.00MB VCores=1                           |
      | WARNING: The following tables are missing relevant table and/or column statistics. |
      | random_nested_db_0.table_0                                                         |
      |                                                                                    |
      | 05:EXCHANGE [UNPARTITIONED]                                                        |
      | |                                                                                  |
      | 01:SUBPLAN                                                                         |
      | |                                                                                  |
      | |--04:NESTED LOOP JOIN [RIGHT OUTER JOIN]                                          |
      | |  |  join predicates: (t3977.pos) = (t3976.field_13)                              |
      | |  |                                                                               |
      | |  |--02:SINGULAR ROW SRC                                                          |
      | |  |                                                                               |
      | |  03:UNNEST [t3976.field_0.field_5 t3977]                                         |
      | |                                                                                  |
      | 00:SCAN HDFS [random_nested_db_0.table_0 t3976]                                    |
      |    partitions=1/1 files=1 size=32.98MB                                             |
      +------------------------------------------------------------------------------------+
      

      The first few rows look like this:

      +-------------+------+
      | field_13    | pos  |
      +-------------+------+
      | -756662132  | NULL |
      | 441414792   | NULL |
      | -1783035865 | NULL |
      | -714649183  | NULL |
      | -1337026208 | NULL |
      | -1754382556 | NULL |
      | -382183064  | NULL |
      | -838360500  | NULL |
      | -1731241459 | NULL |
      | 692876994   | NULL |
      

      To access the machine with the loaded data:

      ssh dev@vd0206.halxg.cloudera.com -p 33334 (pw: cloudera)
      run-all.sh && start-impala-cluster.py
      impala-shell.sh
      use random_nested_db_0;
      

      (core dumps are saved to /tmp/core_files)

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            • Assignee:
              dtsirogiannis Dimitris Tsirogiannis
              Reporter:
              tarasbob Taras Bobrovytsky
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              • Created:
                Updated:
                Resolved: