[GLUTEN-3456][VL] Enable columnar table cache by default and extend benchmark coverage

[yaooqinn]

[GLUTEN-3456][VL] Enable columnar table cache by default and extend benchmark coverage

What changes were proposed in this pull request?

1. Flip spark.gluten.sql.columnar.tableCache default from false to true.
2. Extend ColumnarTableCacheBenchmark to cover:
   • 3 sources: parquet (Velox-native columnar), csv, json (row-based fallback per GLUTEN-3456).
   • 2 schema shapes: 5-col numeric mix, and a 16-col x ~200-char wide-string shape (the GLUTEN-3488 hazard).
   • Cases: count / column-pruning / filter for numeric; count for wide-string.
3. Regenerate ColumnarTableCacheBenchmark-results.txt with the new matrix.

Why are the changes needed?

GLUTEN-3456 raised the concern that for row-based sources (csv/json) the
Velox columnar cache would lose to vanilla Spark because of the R2C/C2R
conversion tax. The extended benchmark shows the opposite is true on
Velox today:

Case	disable (ms)	enable (ms)	speedup
numeric/parquet count	17377	2975	5.84x
numeric/parquet column pruning	20768	3778	5.50x
numeric/parquet filter	22681	4242	5.35x
numeric/csv count	40502	30146	1.34x
numeric/csv column pruning	42245	30667	1.38x
numeric/csv filter	43929	31077	1.41x
numeric/json count	44659	28467	1.57x
numeric/json column pruning	46961	29230	1.61x
numeric/json filter	49106	29061	1.69x
wide-string/parquet count	40888	11863	3.45x
wide-string/csv count	82433	86708	0.95x
wide-string/json count	70729	54856	1.29x

11 / 12 cases improve. The only regression is wide-string/csv count
(-5%), where the Arrow CSV scan + R2C cost on a 16-col x ~200-char shape
slightly outweighs the cache benefit. Given how narrow that corner is,
flipping the default to true is the right trade-off; users hitting
that shape can still set spark.gluten.sql.columnar.tableCache=false.

Hardware: Intel(R) Xeon(R) Platinum 8473C, Linux WSL2, JDK 17. Numbers
are 3-iter Best Time from the regenerated golden file.

How was this patch tested?

• Re-ran ColumnarTableCacheBenchmark in three modes (vanilla / Gluten
  off / Gluten on) and regenerated the golden file.
• ./build/mvn -Pbackends-velox -Pspark-3.5 spotless:apply clean.

Generated-by: Claude Opus 4.7

Related issue: #3456

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