explain cryptic arguments

Signed-off-by: yuxiqian <[email protected]>
apache · Oct 11, 2024 · 4d1a2f0 · 4d1a2f0
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diff --git a/docs/content.zh/docs/core-concept/transform.md b/docs/content.zh/docs/core-concept/transform.md
@@ -155,7 +155,7 @@ Flink CDC uses [Calcite](https://calcite.apache.org/) to parse expressions and [
 
 ## Casting Functions
 
-You can use `CAST( <EXPR> AS <TYPE> )` syntax to convert the type of expressions. Possible conversion paths are:
+You can use `CAST( <EXPR> AS <T> )` syntax to convert any valid expression `<EXPR>` to a specific type `<T>`. Possible conversion paths are:
 
 | Source Type                         | Target Type | Notes                                                                                      |
 |-------------------------------------|-------------|--------------------------------------------------------------------------------------------|

diff --git a/docs/content/docs/core-concept/transform.md b/docs/content/docs/core-concept/transform.md
@@ -155,7 +155,7 @@ Flink CDC uses [Calcite](https://calcite.apache.org/) to parse expressions and [
 
 ## Casting Functions
 
-You can use `CAST( <EXPR> AS <TYPE> )` syntax to convert the type of expressions. Possible conversion paths are:
+You can use `CAST( <EXPR> AS <T> )` syntax to convert any valid expression `<EXPR>` to a specific type `<T>`. Possible conversion paths are:
 
 | Source Type                         | Target Type | Notes                                                                                      |
 |-------------------------------------|-------------|--------------------------------------------------------------------------------------------|