CALCITE-6465: Rework code generator to use Flink code splitter

[jduo]

[jduo]

This builds but introduces a dependency on flink-core. Looking for a way around this.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
83.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[jduo]

@rubenada @julianhyde , just wondering if there was some more feedback on this and would like some clarification on where system tests reside within Calcite. Thanks.

[rubenada]

@jduo , not sure what you mean by "system tests". If you want to add a test with a large dynamic code that fails when this feature is turn off / passes when it is turned on; maybe you could check and adapt the test that was done for the slightly related CALCITE-3094 (and then refined in CALCITE-6593 ): LargeGeneratedJoinTest. The query in that test, with the JOIN_SELECTOR_COMPACT_CODE_THRESHOLD disabled, should throw the "code grows beyond 64 KB InternalCompilerException". At that point, turning on the code splitter from this PR, should make the test pass.

[github-actions[bot]]

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