remove buffer in block_reader of fuse store

[youngsofun]

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Summary

do not need buffer since "we execute exactly 1 seek and 1 read on them."
https://github.com/jorgecarleitao/arrow2/blob/3d528c99589e96f0539de4c07b11843fa22f23ac/examples/parquet_read_async.rs#L31

a buffer with column chunk length is allocated each time.
https://github.com/jorgecarleitao/arrow2/blob/3d528c99589e96f0539de4c07b11843fa22f23ac/src/io/parquet/read/row_group.rs#L126

thanks to @dantengsky
#4212 (comment)

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[mergify]

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[Xuanwo]

Hi, as #4203 is going to merge, how about wait a bit so that we don't need to resolve the conflict?

[youngsofun]

@Xuanwo ok, this is a small pr, I will wait for you to merge first

[Xuanwo]

@Xuanwo ok, this is a small pr, I will wait for you to merge first

Thanks for the patients!

[Xuanwo]

OpenDAL introduces an API redesign. Welcome any feedback for that!

[BohuTANG]

Hi, as #4203 is going to merge, how about wait a bit so that we don't need to resolve the conflict?

Merged!

[BohuTANG]

Does ctx.get_storage_read_buffer_size not used anymore?

[youngsofun]

still in use

[BohuTANG]

These codes also need clean?
https://github.com/datafuselabs/databend/blob/f9971bdf335333ffc2253b60b0842b2a3c8ca6cc/query/src/storages/fuse/io/meta_readers.rs#L182-L184

cc @youngsofun @dantengsky @Xuanwo

[youngsofun]

@BohuTANG not needed for the current parquet2 implementation, but this is function is also used to read our JSON metafile. need a little refactor.