Kamil Braun a690e20966 Fix infinite looping when performing a range query on system.size_estimates. ...

Queries to system.size_estimates table which are not single parition queries
caused Scylla to go into an infinite loop inside multishard_combining_reader::fill_buffer.
This happened because multishard_combinind_reader assumes that shards return rows belonging
to separate partitions, which was not the case for size_estimates_mutation_reader.
This commit fixes the issue and closes #4689.

2019-08-14 12:51:33 +02:00

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