twalthr opened a new pull request #8555: [FLINK-12254][table-common] More preparation for using the new type system URL: https://github.com/apache/flink/pull/8555 ## What is the purpose of the change This PR contains another set of utility classes for enabling the new type system. The most important part is the ValueDataTypeConverter. It basically allows converting literals to DataType. By looking into the actual value instead of just the class, it enabled supporting all sorts of time classes as well as Java's BigDecimal with variable precision and scale. It also contains one important change regarding string literals that improve SQL standard compliance. ## Brief change log See commit messages. ## Verifying this change See `ValueDataTypeConverterTest`. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): no - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: yes - The serializers: no - The runtime per-record code paths (performance sensitive): no - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no - The S3 file system connector: no ## Documentation - Does this pull request introduce a new feature? yes - If yes, how is the feature documented? JavaDocs
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