gustavodemorais commented on code in PR #28111:
URL: https://github.com/apache/flink/pull/28111#discussion_r3188561169
##########
docs/data/sql_functions.yml:
##########
@@ -805,6 +805,22 @@ conversion:
call("TYPEOF", input)
call("TYPEOF", input, force_serializable)
description: Returns the string representation of the input expression's
data type. By default, the returned string is a summary string that might omit
certain details for readability. If force_serializable is set to TRUE, the
string represents a full data type that could be persisted in a catalog. Note
that especially anonymous, inline data types have no serializable string
representation. In this case, NULL is returned.
+ - sql: IS_VALID_UTF8(bytes)
+ table: BYTES.isValidUtf8()
+ description: |
+ Returns `TRUE` if the input is well-formed UTF-8, `FALSE` otherwise.
Specifically rejects: truncated multi-byte sequences (missing continuation
bytes), "overlong" encodings (using more bytes than necessary for the code
point), code points above the Unicode maximum U+10FFFF, and UTF-16 surrogate
values U+D800-U+DFFF (which have no UTF-8 representation). Returns `NULL` if
the input is `NULL`.
+
+ Useful for routing records with invalid UTF-8 to a dead-letter sink:
`WHERE IS_VALID_UTF8(payload)` keeps clean rows; `WHERE NOT
IS_VALID_UTF8(payload)` selects the rejects.
+
+ E.g., `IS_VALID_UTF8(x'48656C6C6F')` returns `TRUE`;
`IS_VALID_UTF8(x'80')` returns `FALSE`.
+ - sql: MAKE_VALID_UTF8(bytes)
+ table: BYTES.makeValidUtf8()
+ description: |
+ Decodes the input as UTF-8, replacing each invalid sequence with the
Unicode replacement character `U+FFFD` (rendered as `�`). The substitution is
lossy and irreversible. Returns `NULL` if the input is `NULL`.
+
+ If you want to explicitly have the behavior of silently substituting
invalid bytes with `U+FFFD` when doing a `CAST(bytes AS STRING)`, replace the
cast with `MAKE_VALID_UTF8(bytes)`.
Review Comment:
I actually think we can drop this sentence for now. The first paragraph
already states clearly what hte function does
```Decodes the input as UTF-8, replacing each invalid sequence with the
Unicode replacement character `U+FFFD` (rendered as `�`). The substitution is
lossy and irreversible. Returns `NULL` if the input is `NULL`.```
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