reswqa

[FLINK-28800][network] HsFileDataManager should avoid busy-loop when fileReader has not data to read

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## What is the purpose of the change *When fileReader has no data to read, for example, most of the data is consumed from memory. HsFileDataManager will encounter busy-loop problem,...

[hotfix] Fix the problem that BatchShuffleItCase not subject to configuration.

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## What is the purpose of the change *Fix the problem that `BatchShuffleItCase` not subject to configuration.* ## Brief change log - *pass configuration to `StreamExecutionEnvironment.getExecutionEnvironment`* ## Verifying this change...

This based on #13528, so I marked this as draft until that one was merged.

fix: Treat Python `None` as null value for `Object` dtype

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This fixes #13538. Alos fixes #13512.

Align null-value handling for all string concatenation functions

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# Description We currently have the following functions to `join/concat` strings, but they don't handle null values in exactly the same way: ### `str.concat` It has an `ignore_nulls` argument to...

Since we have already supports `is_in` for array. It's not hard to implement `contains` then.