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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/02/02 01:43:54 UTC

[GitHub] [iotdb] wangchao316 commented on pull request #902: [IOTDB-28] Calcite Integration for IoTDB

wangchao316 commented on pull request #902:
URL: https://github.com/apache/iotdb/pull/902#issuecomment-771285262


   hi all, The project was developed based on calcite and avatica. calcite has some problems:
   1. For simple query optimization, using calcite is too heavy.
   2. When calcite generates the execution plan tree, some class files are generated, which may cause memory overflow. This is because there are too many fields in the search criteria.
   For example, slelect * from a in (1, 2, 3, 4.....500),
   This will cause oom.


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