Github user hl475 commented on the issue:
https://github.com/apache/spark/pull/16556
@srowen: We donât use LAPACK here since there is no pivoted QR in LAPACK
that stops when the rank is exhausted. This is highlighted in the inline
comments [563 to
565](https://github.com/apache/spark/pull/16556/files#diff-00e48e38779d4534190bf78a0fd962dbR563).
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