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CASSANDRA-21415: Document COPY TO limitation for control characters in text columns #4856

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CASSANDRA-21415: Document COPY TO limitation for control characters in text columns #4856

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arvindKandpal-ksolves Jun 1, 2026
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13 changes: 13 additions & 0 deletions doc/modules/cassandra/pages/managing/tools/cqlsh.adoc
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Expand Up @@ -461,6 +461,19 @@ value `STDOUT` (without single quotes) to print the CSV to stdout.
See `shared-copy-options` for options that apply to both `COPY TO` and
`COPY FROM`.

[NOTE]
====
`COPY TO` exports CSV using a restricted RFC 4180-compatible format and does not
preserve control characters in text column values. Text columns containing control characters
such as newlines (`\n`), carriage returns (`\r`), null bytes (`\x00`),
or other non-printable characters cannot be reliably exported — values
will be corrupted on re-import via `COPY FROM`. Beyond data integrity,
non-printable characters in CSV output can pose security risks, including
CSV injection and other forms of malicious data embedding. If your data
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contains such characters, consider using DSBulk, Spark, or
`sstableloader` for data migration instead.
====

==== Options for `COPY TO`

`MAXREQUESTS`::
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