zstraw

Add env preparation without docker.

If arctic's file-store only have data in base-table, but nothing in change-table, arctic source will reading nothing in ContinuousSplitPlannerImpl#discoverInitialSplits because changeSnapshot in change-table is null. The data in base-table can...

FIX #459 ## Why are the changes needed? Project pushdown may lead to the missing of primary key, partition key. ShuffleHelper may lose the required info, and produce NPE. This...

### What happened? Project pushdown may lead to the missing of primary key, partition key, watermark field. ShuffleHelper and watermark generator may lose the required info, and produce NPE. ###...