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planner: add docs for some variables #9943

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Aug 18, 2022
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planner: add docs for some variables #9943

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fix ci
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Update system-variables.md 
Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
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qw4990 and TomShawn authored Aug 16, 2022
commit d0f5d3c7df65be7ec6c8f031fb4716db2e1c6f20
2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1839,7 +1839,7 @@ For a system upgraded to v5.0 from an earlier version, if you have not modified
- Type: Float
- Range: `[0, 2147483647]`
- Default value: `1.5`
- Indicates the I/O cost of TiDB to read/write one byte from/to the temporary disk. It's used by the [Cost Model](/cost-model.md).
- Indicates the I/O cost for TiDB to read or write one byte of data from or to the temporary disk. This variable is internally used in the [Cost Model](/cost-model.md).
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### tidb_opt_distinct_agg_push_down

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