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Deleted description about not supporting some features. #6157

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Aug 13, 2021
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Deleted description about not supporting some features. #6157

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deleted roadmap.md
hfxsd Aug 2, 2021
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Deleted description about not supporting features
hfxsd Aug 13, 2021
41cf838
Merge branch 'master' into usetiflash
TomShawn Aug 13, 2021
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3 changes: 0 additions & 3 deletions tiflash/use-tiflash.md
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Expand Up @@ -389,6 +389,3 @@ Currently, TiFlash does not support some features. These features might be incom
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In the example above, `a/b`'s inferred type from the compiling is `Decimal(7,4)` both in TiDB and in TiFlash. Constrained by `Decimal(7,4)`, `a/b`'s returned type should be `0.0000`. In TiDB, `a/b`'s runtime precision is higher than `Decimal(7,4)`, so the original table data is not filtered by the `where a/b` condition. However, in TiFlash, the calculation of `a/b` uses `Decimal(7,4)` as the result type, so the original table data is filtered by the `where a/b` condition.

* The MPP mode in TiFlash does not support the following features:
* If the [`new_collations_enabled_on_first_bootstrap`](/tidb-configuration-file.md#new_collations_enabled_on_first_bootstrap) configuration item's value is `true`, the MPP mode does not support the string-type join key or the string column type in the `group by` aggregation. For these two query types, the MPP mode is not selected by default.