Unloading data into stage

[BohuTANG]

Summary

• Unloading into a Databend Internal Stage
• Unloading into a Databend External Stage

COPY INTO { internalStage | externalStage | externalLocation }
     FROM { [<database_name>.]<table_name> | ( <query> ) }
[ FILE_FORMAT = ( { TYPE = { CSV | JSON | PARQUET } [ formatTypeOptions ] } ) ]
[ copyOptions ]
[ VALIDATION_MODE = RETURN_ROWS ]

Reference:
https://docs.snowflake.com/en/user-guide-data-unload.html

[BohuTANG]

Seems we need a Input and Output Format crate with write&read trait? Now, the csv/parquet only has read, cc @sundy-li

[BohuTANG]

For parquet Input/Output format, fuse engine can re-use it too.

[wubx]

if use CSV, JSON support zip?

[BohuTANG]

if use CSV, JSON support zip?

Sure