Add Presto platform with engine-only integration tests#773
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Implement Presto (PrestoDB) as a Wayang platform module extending JdbcPlatformTemplate, same pattern as wayang-trino.
Run the whole Wayang plan, including the terminal sink, inside Presto: register only Presto.plugin(), end every PrestoOperatorsIT test in a TableSink that compiles to CREATE TABLE ... AS SELECT, and assert results via plain JDBC after execute() returns. - jdbc-template JdbcExecutor.executeSinkStage: use selectStartTask for multi-source joins and collect global-reduce/reduce-by/sort into the composed CREATE TABLE AS SELECT (ported from wayang-trino-only-test). - api-scala-java DataQuantaBuilder: add withSqlUdf/withSqlUdfs on the reduce/join/sort builders so JavaPlanBuilder tests can push SQL down. - PrestoOperatorsIT: 13 engine-only tests (8 operator-level + 5 JavaPlanBuilder); join Tuple2->Record handled by a test-only flatten mapping to PrestoProjectionOperator. - improvement.md: document the engine-only shape. Verified against live PrestoDB (memory connector): Tests run: 13, Failures: 0, Errors: 0, Skipped: 0; 13 CREATE TABLE AS SELECT executed in Presto. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
This PR adds the Wayang Presto platform implementation and engine-only integration tests.
What is included
wayang-prestoplatform module.PrestoOperatorsITcoverage for each operator.Presto.plugin().Validation
apache/wayang:main.