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Add description about table name/alias specifying for read_from_storage hint (#6164) #6281

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Aug 26, 2021
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Add description about table name/alias specifying for read_from_storage hint (#6164) #6281

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Add description about table name/alias specifying for read_from_stora…
zanmato1984 Aug 13, 2021
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Update optimizer-hints.md
TomShawn Aug 26, 2021
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2 changes: 1 addition & 1 deletion optimizer-hints.md
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Expand Up @@ -188,7 +188,7 @@ select /*+ AGG_TO_COP() */ sum(t1.a) from t t1;

### READ_FROM_STORAGE(TIFLASH[t1_name [, tl_name ...]], TIKV[t2_name [, tl_name ...]])

The `READ_FROM_STORAGE(TIFLASH[t1_name [, tl_name ...]], TIKV[t2_name [, tl_name ...]])` hint tells the optimizer to read specific table(s) from specific storage engine(s). Currently, this hint supports two storage engine parameters - `TIKV` and `TIFLASH`. For example:
The `READ_FROM_STORAGE(TIFLASH[t1_name [, tl_name ...]], TIKV[t2_name [, tl_name ...]])` hint tells the optimizer to read specific table(s) from specific storage engine(s). Currently, this hint supports two storage engine parameters - `TIKV` and `TIFLASH`. If a table has an alias, use the alias as the parameter of `READ_FROM_STORAGE()`; if the table does not has an alias, use the table's original name as the parameter. For example:

{{< copyable "sql" >}}

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