zhztheplayer commented on a change in pull request #1014: [CALCITE-2804] Druid
adapter: Cast does not work when casting to timestamp
URL: https://github.com/apache/calcite/pull/1014#discussion_r275119933
##########
File path:
druid/src/main/java/org/apache/calcite/adapter/druid/DruidSqlCastConverter.java
##########
@@ -129,13 +129,13 @@
private static String castCharToDateTime(
TimeZone timeZone,
String operand,
- final SqlTypeName toType, String format) {
+ final SqlTypeName toType, final SqlTypeName fromType) {
Review comment:
Though I can see the reason of this change, to me it is more like a
workaround.
Now in the PR we call the method by code:
```java
castCharToDateTime(
timeZone,
castDateTimeToChar(DateTimeUtils.UTC_ZONE, operandExpression,
fromType),
toType,
fromType);
```
I suggest to change to something like:
```java
castCharToDateTime(
timeZone,
castDateTimeToChar(DateTimeUtils.UTC_ZONE, operandExpression,
fromType),
toType,
dateTimeFormatString(fromType));
```
This way the change of signature on `castCharToDateTime(...)`can be avoided.
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