GoogleCloudPlatform / google-cloud-java / 4237

72%

Pull #2263

travis-ci

Cloud Spanner: Check duplicate columns in Mutation

close #2257

* Adds `checkDuplicateColumns`, executed before a mutation is built, to
    ensure each column name is only used once. Note that column names
    are case-insensitive according to the [DDL
    docs](https://cloud.google.com/spanner/docs/data-definition-language#create_table).
* Tests duplicate columns with the same case and different cases.
* Removes duplicate column check in `asMap` because all `Mutation`s are
    now guaranteed not to have duplicate columns. Removes corresponding test code too.

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