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VReplication (and by product, Online DDL): support GENERATED column as part of PRIMARY KEY #8335

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shlomi-noach
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@shlomi-noach shlomi-noach commented Jun 15, 2021

Description

Worked to add/fix Online DDL/VReplication suite test generated-columns57-unique, an dended up fixing something more generic to VReplication:

  1. In MySQL it is valid to have a generated column as part of the PRIMARY KEY.
  2. In VReplication, we skip reading GENERATED columns
  3. In VReplication, we validate we've read all PRIMARY KEY columns

The combination of (2+3) contradicts (1).

With this PR, VReplication does not require (3) for GENERATED columns.

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Checklist

  • Tests were added or are not required
  • Documentation was added or is not required

…s part of PRIMARY KEY

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
@rohit-nayak-ps
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This is nice! Another edge case in vreplication handled :-)

The online ddl test tests both the copy and replication phase, right? So we don't need to add explicit tests for this case as part of the vcopier/vplayer testsuite, right?

@shlomi-noach
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The online ddl test tests both the copy and replication phase, right?

Correct!

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@rohit-nayak-ps rohit-nayak-ps left a comment

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lgtm

@shlomi-noach shlomi-noach merged commit e182ce2 into vitessio:main Jun 15, 2021
@shlomi-noach shlomi-noach deleted the vreplication-generated-column-part-of-pk branch June 15, 2021 08:50
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2 participants