Heikki Linnakangas c532d15ddd Split copy.c into four files. ... Copy.c has grown really large. Split it into more manageable parts: - copy.c now contains only a few functions that are common to COPY FROM and COPY TO. - copyto.c contains code for COPY TO. - copyfrom.c contains code for initializing COPY FROM, and inserting the tuples to the correct table. - copyfromparse.c contains code for reading from the client/file/program, and parsing the input text/CSV/binary format into tuples. All of these parts are fairly complicated, and fairly independent of each other. There is a patch being discussed to implement parallel COPY FROM, which will add a lot of new code to the COPY FROM path, and another patch which would allow INSERTs to use the same multi-insert machinery as COPY FROM, both of which will require refactoring that code. With those two patches, there's going to be a lot of code churn in copy.c anyway, so now seems like a good time to do this refactoring. The CopyStateData struct is also split. All the formatting options, like FORMAT, QUOTE, ESCAPE, are put in a new CopyFormatOption struct, which is used by both COPY FROM and TO. Other state data are kept in separate CopyFromStateData and CopyToStateData structs. Reviewed-by: Soumyadeep Chakraborty, Erik Rijkers, Vignesh C, Andres Freund Discussion: https://www.postgresql.org/message-id/8e15b560-f387-7acc-ac90-763986617bfb%40iki.fi		2020-11-23 10:50:50 +02:00
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