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[SPARK-40697][SQL][FOLLOWUP] Read-side char padding should only be ap…
…plied if necessary ### What changes were proposed in this pull request? This is a followup of #38151, to fix a perf issue. When struct/array/map doesn't contain char type field, we should not recreate the struct/array/map for nothing. ### Why are the changes needed? fix a perf issue ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? new test Closes #38479 from cloud-fan/char. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: Gengliang Wang <gengliang@apache.org>
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