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## What changes were proposed in this pull request? tallSkinnyQR of RowMatrix should aware of empty partition, which could cause exception from Breeze qr decomposition. See the [archived dev mail](https://mail-archives.apache.org/mod_mbox/spark-dev/201510.mbox/%3CCAF7ADNrycvPL3qX-VZJhq4OYmiUUhoscut_tkOm63Cm18iK1tQmail.gmail.com%3E) for more details. ## How was this patch tested? Scala unit test. Author: Xusen Yin <yinxusen@gmail.com> Closes #14049 from yinxusen/SPARK-16369. |
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