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  1. MariaDB Server
  2. MDEV-39936

FULL JOIN result difference1

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Fixed
    • None
    • N/A
    • Optimizer
    • None
    • Unexpected results
    • Q2/2026 Server Development, Q3/2026 Server Maintenance

    Description

      Result Mismatch (21) vs (13) :
      MariaDB rows (21):

      18	1984-02-07	18	NULL	NULL	NULL	y	NULL
      18	NULL	0	2	2	v	y	62
      18	NULL	NULL	NULL	NULL	NULL	y	1
      18	NULL	NULL	NULL	NULL	NULL	y	1
      18	NULL	NULL	NULL	NULL	NULL	y	1
      18	NULL	NULL	NULL	NULL	a	y	0
      18	NULL	NULL	NULL	NULL	c	y	2
      18	NULL	NULL	NULL	NULL	c	y	7
      18	NULL	NULL	NULL	NULL	e	y	7
      18	NULL	NULL	NULL	NULL	i	y	7
      18	NULL	NULL	NULL	NULL	j	y	1
      18	NULL	NULL	NULL	NULL	p	y	1
      18	NULL	NULL	NULL	NULL	q	y	1
      18	NULL	NULL	NULL	NULL	r	y	1
      18	NULL	NULL	NULL	NULL	r	y	5
      18	NULL	NULL	NULL	NULL	s	y	7
      18	NULL	NULL	NULL	NULL	v	y	4
      18	NULL	NULL	NULL	NULL	v	y	9
      18	NULL	NULL	NULL	NULL	x	y	0
      18	NULL	NULL	NULL	NULL	y	y	8
      18	NULL	NULL	NULL	NULL	z	y	5
      

      Postgres rows (13):

      18	1984-02-07	18	NULL	NULL	NULL	y	NULL
      18	NULL	0	2	2	v	y	62
      18	NULL	NULL	NULL	NULL	NULL	y	1
      18	NULL	NULL	NULL	NULL	NULL	y	1
      18	NULL	NULL	NULL	NULL	a	y	0
      18	NULL	NULL	NULL	NULL	c	y	2
      18	NULL	NULL	NULL	NULL	j	y	1
      18	NULL	NULL	NULL	NULL	q	y	1
      18	NULL	NULL	NULL	NULL	r	y	1
      18	NULL	NULL	NULL	NULL	r	y	5
      18	NULL	NULL	NULL	NULL	v	y	9
      18	NULL	NULL	NULL	NULL	y	y	8
      18	NULL	NULL	NULL	NULL	z	y	5
      

      How to repro:

      --------------------------
      mariadb-setup.txt
      mariadb-query3.txt

      postgres-setup.txt
      postgres-query3.txt

      Attachments

        1. mariadb-query3.txt
          0.9 kB
        2. mariadb-setup.txt
          134 kB
        3. postgres-query3.txt
          0.9 kB
        4. postgres-setup.txt
          134 kB

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              Gosselin Dave Gosselin
              mariadb-pavithrapandith Pavithra Pandith
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              Dates

                Created:
                Updated:
                Resolved:

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