Anthrino commented on code in PR #3677:
URL: https://github.com/apache/calcite/pull/3677#discussion_r1554345497
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core/src/main/java/org/apache/calcite/adapter/enumerable/RexToLixTranslator.java:
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@@ -469,34 +349,48 @@ private Expression getConvertExpression(
final SqlIntervalQualifier interval =
sourceType.getIntervalQualifier();
switch (sourceType.getSqlTypeName()) {
+ // If format string is supplied, return formatted date/time/timestamp
case DATE:
- return RexImpTable.optimize2(operand,
- Expressions.call(BuiltInMethod.UNIX_DATE_TO_STRING.method,
- operand));
+ return RexImpTable.optimize2(operand,
Expressions.isConstantNull(format)
+ ? Expressions.call(BuiltInMethod.UNIX_DATE_TO_STRING.method,
operand)
+ : Expressions.call(
+ Expressions.new_(
+ BuiltInMethod.FORMAT_DATE.method.getDeclaringClass()),
+ BuiltInMethod.FORMAT_DATE.method, format, operand));
case TIME:
- return RexImpTable.optimize2(operand,
- Expressions.call(BuiltInMethod.UNIX_TIME_TO_STRING.method,
- operand));
+ return RexImpTable.optimize2(operand,
Expressions.isConstantNull(format)
Review Comment:
Not exactly, we could only move the `RexImpTable.optimize2()` call outside
the switch, but the specific method called to evaluate the CAST depends on the
from and to cast data types, and with this change also if there is a `FORMAT`
present. So the number of lines would still look the same could move out one
level of nesting with that optimize call and return statements outside. Does
that seem like a better pattern?
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