[SPARK-58223][SQL][4.1] Fix SparkSession.Builder.classic() building a Connect session#57391
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[SPARK-58223][SQL][4.1] Fix SparkSession.Builder.classic() building a Connect session#57391LuciferYang wants to merge 1 commit into
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…ect session `SparkSession.Builder.classic()` passed `CONNECT_COMPANION` to `mode(...)`, identical to `connect()`: ```scala def classic(): this.type = mode(CONNECT_COMPANION) def connect(): this.type = mode(CONNECT_COMPANION) ``` `companion` drives `builder()` (`companion.builder()`), so on a classpath with both implementations `SparkSession.builder().classic().getOrCreate()` built a Connect session rather than a Classic one. This changes `classic()` to pass `CLASSIC_COMPANION` (which is already defined and used by the config-key path `API_MODE_CLASSIC => CLASSIC_COMPANION`). It also adds regression coverage: `SparkSessionBuilderImplementationBindingSuite` gains a shared `implementationSpecificBuilder` hook and a test asserting the built session is in the expected package, exercised by both the Classic (`.classic()`) and Connect (`.connect()`) concrete suites -- the mode selectors previously had no coverage. `builder().classic()` does not honor its contract: it returns a Connect session (or fails, if only the classic implementation is available), contradicting the method name and scaladoc. Introduced by SPARK-49700; present since 4.1.0. Yes. `SparkSession.builder().classic().getOrCreate()` now builds a Classic session as documented, instead of a Connect session. This is a bug fix relative to released 4.1.x. New shared test `SPARK-58223: mode selector binds to the correct implementation` in `SparkSessionBuilderImplementationBindingSuite`, run by both the Classic and Connect suites. Verified reproduce-then-fix: the Classic case fails on the unfixed tree (the built session is not in `org.apache.spark.sql.classic`) and passes after the fix; the classic suite passes. Generated-by: Claude Code (Opus 4.8) Closes apache#57379 from LuciferYang/SPARK-classic-builder. Authored-by: YangJie <yangjie01@baidu.com> Signed-off-by: yangjie01 <yangjie01@baidu.com> (cherry picked from commit 55e386d)
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Thank you @LuciferYang! cc @HyukjinKwon
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What changes were proposed in this pull request?
SparkSession.Builder.classic()passedCONNECT_COMPANIONtomode(...), identical toconnect():companiondrivesbuilder()(companion.builder()), so on a classpath with both implementationsSparkSession.builder().classic().getOrCreate()built a Connect session rather than a Classic one. This changesclassic()to passCLASSIC_COMPANION(which is already defined and used by the config-key pathAPI_MODE_CLASSIC => CLASSIC_COMPANION).It also adds regression coverage:
SparkSessionBuilderImplementationBindingSuitegains a sharedimplementationSpecificBuilderhook and a test asserting the built session is in the expected package, exercised by both the Classic (.classic()) and Connect (.connect()) concrete suites -- the mode selectors previously had no coverage.Why are the changes needed?
builder().classic()does not honor its contract: it returns a Connect session (or fails, if only the classic implementation is available), contradicting the method name and scaladoc. Introduced by SPARK-49700; present since 4.1.0.Does this PR introduce any user-facing change?
Yes.
SparkSession.builder().classic().getOrCreate()now builds a Classic session as documented, instead of a Connect session. This is a bug fix relative to released 4.1.x.How was this patch tested?
New shared test
SPARK-58223: mode selector binds to the correct implementationinSparkSessionBuilderImplementationBindingSuite, run by both the Classic and Connect suites. Verified reproduce-then-fix: the Classic case fails on the unfixed tree (the built session is not inorg.apache.spark.sql.classic) and passes after the fix; the classic suite passes.Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Opus 4.8)