sgrebnov commented on code in PR #11494:
URL: https://github.com/apache/datafusion/pull/11494#discussion_r1680208153
##########
datafusion/sql/src/unparser/dialect.rs:
##########
@@ -45,6 +45,13 @@ pub trait Dialect {
fn interval_style(&self) -> IntervalStyle {
IntervalStyle::PostgresVerbose
}
+
+ // Does the dialect use CHAR to cast Utf8 rather than TEXT?
+ // E.g. MySQL requires CHAR instead of TEXT and automatically produces a
string with
+ // the VARCHAR, TEXT or LONGTEXT data type based on the length of the
string
+ fn use_char_for_utf8_cast(&self) -> bool {
Review Comment:
@alamb - updated: added the following Dialect configuration:
```rust
// Specifies which data type to use for Arrow Utf8 unparsing
// Most dialects use VARCHAR, but some, like MySQL, require CHAR
fn utf8_cast_dtype(&self) -> ast::DataType {
ast::DataType::Varchar(None)
}
// Specifies which data type to use for Arrow LargeUtf8 unparsing
// Most dialects use TEXT, but some, like MySQL, require CHAR
fn large_utf8_cast_dtype(&self) -> ast::DataType {
ast::DataType::Text
}
```
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