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Do not overwrite data with null when updating (#275) #276

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Do not overwrite data with null when updating (#275) #276

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Commits on May 11, 2022

  1. Do not overwrite data with null when updating (transferwise#275) 

    Record messages for some updates from certain taps, e.g.
Postgres with log-based replication when doing deletes,
will only contain metadata and pkey columns. The current
MERGE logic would then set all non-included columns in the
target to null.
    @Tolsto
    Tolsto committed May 11, 2022
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  2. Add build directory to .gitignore

    @Tolsto
    Tolsto committed May 11, 2022
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  3. Merge records into batch 

    We cannot assume here that the latest version of a record
will always contain all columns. For instance, in the case
of delete records coming from Postgres via log-based replication
the record message will only contain the primary key columns.
    @Tolsto
    Tolsto committed May 11, 2022
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