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PostgreSQL 9.4.26 Documentation
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46.7. Logical Decoding Output Writers

It is possible to add more output methods for logical decoding. For details, see src/backend/replication/logical/logicalfuncs.c. Essentially, three functions need to be provided: one to read WAL, one to prepare writing output, and one to write the output (see Section 46.6.5).

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