[spark] Reduce paimon-spark-4.0 shadows via SparkShim copy factories#7721
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kerwin-zk wants to merge 1 commit intoapache:masterfrom
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[spark] Reduce paimon-spark-4.0 shadows via SparkShim copy factories#7721kerwin-zk wants to merge 1 commit intoapache:masterfrom
kerwin-zk wants to merge 1 commit intoapache:masterfrom
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Purpose
Follow-up to #7648 (Spark 4.1 module). After the reverse-shim layout landed, three of the files copied into
paimon-spark-4.0/src/mainonly differed across versions because ofcase class .copy(...)calls on Spark types whose arity changed between 4.0.2 and 4.1.1:DataSourceV2RelationgainedOption[TimeTravelSpec](8 → 9 fields) —relation.copy(table = ...)compiled against 4.1.1 emitscopy\$default\$9, which crashes on 4.0 withNoSuchMethodError.TableSpecgainedSeq[Constraint](8 → 9 fields) — same problem forspec.copy(location = ...)andspec.copy(properties = ...).Per-version scalac is the only thing that knows the right
copy\$default\$Nto emit, so we route those three calls through newSparkShimfactories (one per call site). The implementations live inSpark3Shim/Spark4Shim(plus the 4.0 override), and the cross-version source files no longer need to be physically duplicated.Tests
CI
API and Format
No new public API. Three internal helper methods added to
org.apache.spark.sql.paimon.shims.SparkShim:copyDataSourceV2Relation(relation, newTable)copyTableSpecLocation(spec, location)copyTableSpecProperties(spec, properties)