infoverload commented on a change in pull request #18813:
URL: https://github.com/apache/flink/pull/18813#discussion_r810097365
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File path: docs/content/docs/dev/table/types.md
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@@ -1487,6 +1481,88 @@ Not supported.
{{< /tab >}}
{{< /tabs >}}
+Casting
+-------
+
+Flink SQL can perform casting between a defined pair `from` type and `target`
type. While some
+casting operations can always succeed no matter the input value, others can
fail at runtime, that
+is, for some input values there is no way to create a value for the target
type. For example, it's
+always possible to convert `INT` to `STRING`, but viceversa is not true, as
you can provide an
+input `STRING` which cannot be converted to `INT`, like `'abc'`.
Review comment:
```suggestion
Flink SQL can perform casting between a defined `from` type and `target`
type pair. While some
casting operations can always succeed regardless of the input value, others
can fail at runtime
(i.e. when there is no way to create a value for the target type). For
example, it is always possible
to convert `INT` to `STRING`, but you can provide an input `STRING` which
cannot be converted
to `INT`.
```
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