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Old API since v2.18.0. Superseded by convert_to_columnstore(). However, compression APIs are still supported, you do not need to migrate to the hypercore APIs. Recompresses a compressed that had more data inserted after compression. 
recompress_chunk(
    chunk REGCLASS,
    if_not_compressed BOOLEAN = false
)
You can also recompress s by running the job associated with your compression policy. recompress_chunk gives you more fine-grained control by allowing you to target a specific .
recompress_chunk is deprecated since v2.14 and will be removed in the future. The procedure is now a wrapper which calls compress_chunk instead of it.
recompress_chunk is implemented as an SQL procedure and not a function. Call the procedure with CALL. Don’t use a SELECT statement.
recompress_chunk only works on s that have previously been compressed. To compress a for the first time, use compress_chunk.

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Samples

Recompress the timescaledb_internal._hyper_1_2_chunk: 
CALL recompress_chunk('_timescaledb_internal._hyper_1_2_chunk');

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Arguments

The syntax is: 
CALL recompress_chunk(
    chunk = '<chunk_name>',
    if_not_compressed = true | false
);
NameTypeDefaultRequiredDescription
chunkREGCLASS-✔The to be recompressed. Must include the schema, for example _timescaledb_internal, if it is not in the search path.
if_not_compressedBOOLEANfalse-If true, prints a notice instead of erroring if the is already compressed.

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Troubleshoot

In TimescaleDB 2.6.0 and above, recompress_chunk is implemented as a procedure. Previously, it was implemented as a function. If you are upgrading to TimescaleDB 2.6.0 or above, therecompress_chunk function could cause an error. For example, trying to run SELECT recompress_chunk(i.show_chunks, true) FROM... gives the following error: 
ERROR:  recompress_chunk(regclass, boolean) is a procedure
To fix the error, use CALL instead of SELECT. You might also need to write a procedure to replace the full functionality in your SELECT statement. For example: 
DO $$
DECLARE chunk regclass;
BEGIN
  FOR chunk IN SELECT format('%I.%I', chunk_schema, chunk_name)::regclass
  FROM timescaledb_information.chunks
  WHERE is_compressed = true
  LOOP
    RAISE NOTICE 'Recompressing %', chunk::text;
    CALL recompress_chunk(chunk, true);
  END LOOP;
END
$$;