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tiflash: Remove the description about expr_blacklist in use_tiflash.md (#6188) #6276

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ti-chi-bot merged 4 commits into from
Aug 30, 2021
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tiflash: Remove the description about expr_blacklist in use_tiflash.md (#6188) #6276

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72a37d3
This is an automated cherry-pick of #6188
Liuxiaozhen12 Aug 26, 2021
48a6fde
Update tiflash/use-tiflash.md
Liuxiaozhen12 Aug 30, 2021
ba07b82
Update tiflash/use-tiflash.md
Liuxiaozhen12 Aug 30, 2021
6db7f8c
Update use-tiflash.md
Liuxiaozhen12 Aug 30, 2021
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5 changes: 1 addition & 4 deletions tiflash/use-tiflash.md
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Expand Up @@ -232,12 +232,9 @@ set @@session.tidb_opt_broadcast_join=1
Currently, TiFlash supports pushing down a limited number of expressions, including:

```
+, -, /, *, >=, <=, =, !=, <, >, ifnull, isnull, bitor, in, bitand, or, and, like, not, case when, month, substr, timestampdiff, date_format, from_unixtime, json_length, if, bitneg, bitxor,
round without fraction, cast(int as decimal), date_add(datetime, int), date_add(datetime, string), min, max, sum, count, avg, approx_count_distinct
+, -, /, *, >=, <=, =, !=, <, >, ifnull, isnull, bitor, in, bitand, or, and, like, not, case when, month, substr, timestampdiff, date_format, from_unixtime, json_length, if, bitneg, bitxor, round without fraction, cast(int as decimal), min, max, sum, count, avg, approx_count_distinct
```

Among them, the push-down of `cast` and `date_add` is not enabled by default. To enable it, refer to [Blocklist of Optimization Rules and Expression Pushdown](/blocklist-control-plan.md).

TiFlash does not support push-down calculations in the following situations:

- Expressions that contain the `Time` type cannot be pushed down.
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