dbatomic opened a new pull request, #44901:
URL: https://github.com/apache/spark/pull/44901
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### What changes were proposed in this pull request?
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This PR represents initial change for introducing collation concept into
Spark engine. For higher level overview please take a look at the umbrella
[JIRA](https://issues.apache.org/jira/browse/SPARK-46830).
This PR extends both `StringType` and `PhysicalStringType` with collationId
field. At this point this is just a noop field. In the following PRs this field
will be used for fetching right UTF8String comparison rules from global
collation table.
Goal is to make sure that we keep backwards compatibility - this is ensured
by keeping singleton `object StringType` that inherits
`StringType(DEFAULT_COLLATION_ID)`. DEFAULT_COLLATION_ID represents UTF8 Binary
collation rules (i.e. byte for byte comparison, that is already used in Spark).
Hence, any code that relies on `StringType` will stay binary compatible with
this version.
It may be hard to see end state from just this initial PR. For reviewers who
want to see how this will fit in the end state, please take a look at this
draft [PR](https://github.com/apache/spark/pull/44537).
### Why are the changes needed?
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Please refer to umbrella JIRA ticket for collation effort.
### Does this PR introduce _any_ user-facing change?
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At this point No.
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This initial PR doesn't introduce any surface level changes.
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No
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