[SPARK-53799][SPARK-53800][SS][DSV2] Enable column pruning and predicate pushdown in DSV2 streaming #52516
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What changes were proposed in this pull request?
Enable column pruning and predicate pushdown in DSV2 streaming.
The pushdown happens during analysis instead of relying on the optimizer. The streaming execution needs an actual V2 Scan early so we can materialize a
SparkDataStreamviaScan.toMicroBatchStreamorScan.toContinuousStream.Why are the changes needed?
To reduce data read and compute in streaming queries by pushing filters and projecting only needed columns into DSv2 readers, aligning streaming with batch DSv2 capabilities.
Does this PR introduce any user-facing change?
No
How was this patch tested?
New unit tests
Was this patch authored or co-authored using generative AI tooling?
No