Data input hooks (WIP)

[lmangani]

Work in progress for tracking and comments only

Changelog category:

• New Feature

Changelog entry

Optional handlers for --input_format and data input --file

[lmangani]

@auxten @laodouya perhaps --file could be attached to a FIFO named pipe? This way whatever the python app pushes to the FIFO ahead of execution could be processed by the query.

The desired effect being able to do the following directly from python code

# python3 -m chdb "SELECT 1", "Native" > output.native
# python3 -m chdb "SELECT * FROM table" < output.native
1 

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