zhengruifeng 8b62399684 [SPARK-29380][ML] RFormula avoid repeated 'first' jobs to get vector size ... ### What changes were proposed in this pull request? get the first row lazily, and reuse it for each vector column. ### Why are the changes needed? avoid unnecssary `first` jobs ### Does this PR introduce any user-facing change? no ### How was this patch tested? existing testsuites & local tests in repl Closes #26052 from zhengruifeng/rformula_lazy_row. Authored-by: zhengruifeng <ruifengz@foxmail.com> Signed-off-by: zhengruifeng <ruifengz@foxmail.com>		2019-10-12 22:25:36 +08:00
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benchmarks	[SPARK-29297][TESTS] Compare core/mllib module benchmarks in JDK8/11	2019-09-29 21:43:58 -07:00
src	[SPARK-29380][ML] RFormula avoid repeated 'first' jobs to get vector size	2019-10-12 22:25:36 +08:00
pom.xml	[SPARK-29007][MLLIB][FOLLOWUP] Remove duplicated dependency	2019-09-13 11:54:46 -07:00