Santiago M. Mola created CALCITE-736:
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Summary: Remove the use of Guava types from public methods and
fields
Key: CALCITE-736
URL: https://issues.apache.org/jira/browse/CALCITE-736
Project: Calcite
Issue Type: Improvement
Reporter: Santiago M. Mola
Assignee: Julian Hyde
Priority: Minor
Guava is involved in major dependency hells in Java, with Hadoop the most
affected ecosystem.
Removing Guava types from visible parts of Calcite API will help containing
damage to backwards compatibility if/when, at some point, shading needs to be
done.
This seems quite doable in calcite, since most of its use of Guava in public
API is ImmutableList. Rewriting it to List and internally doing defensive
copies with ImmutableList.copyOf (which does not really copy if the input is
already an ImmutableList) should have a negligible impact.
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