DBConnection.Query.encode

You're seeing just the function encode, go back to DBConnection.Query module for more information.
Link to this function

encode(query, params, opts)

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Specs

encode(any(), any(), Keyword.t()) :: any()

Encode parameters using a query.

This function is called to encode a query before it is executed using a connection callback module.

If this function raises DBConnection.EncodeError, then the query is prepared once again.

See DBConnection.execute/3.