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[SPARK-3977] Conversion methods for BlockMatrix to other Distributed …
…Matrices The conversion methods for `BlockMatrix`. Conversions go through `CoordinateMatrix` in order to cause a shuffle so that intermediate operations will be stored on disk and the expensive initial computation will be mitigated. Author: Burak Yavuz <brkyvz@gmail.com> Closes #4256 from brkyvz/SPARK-3977PR and squashes the following commits: 4df37fe [Burak Yavuz] moved TODO inside code block b049c07 [Burak Yavuz] addressed code review feedback v1 66cb755 [Burak Yavuz] added default toBlockMatrix conversion 851f2a2 [Burak Yavuz] added better comments and checks cdb9895 [Burak Yavuz] [SPARK-3977] Conversion methods for BlockMatrix to other Distributed Matrices
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