Provide an interface for data viewing that allows interactive data observation functionality.

[jieguangzhou]

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It can return either a DataFrame or a list of dict.

This helps us easily view the data in the database.

For example:

db['documents'].data
db['documents'].data[:10]

db['documents'].data(id='xxxx')

listener.data # return the data from select
listener.output_data # return the data from listener.output_select