Anthrino commented on code in PR #3677:
URL: https://github.com/apache/calcite/pull/3677#discussion_r1498174614
##########
core/src/main/java/org/apache/calcite/adapter/enumerable/RexToLixTranslator.java:
##########
@@ -647,58 +541,225 @@ private static Expression checkExpressionPadTruncate(
}
}
+ private Expression translateCastToDate(RelDataType sourceType,
+ Expression operand, ConstantExpression format,
+ Supplier<Expression> defaultExpression) {
+
+ switch (sourceType.getSqlTypeName()) {
+ case CHAR:
+ case VARCHAR:
+ // If format string is supplied, parse formatted string into date
+ return Expressions.isConstantNull(format)
+ ? Expressions.call(BuiltInMethod.STRING_TO_DATE.method, operand)
+ :
Expressions.call(Expressions.new_(BuiltInMethod.PARSE_DATE.method.getDeclaringClass()),
+ BuiltInMethod.PARSE_DATE.method, format, operand);
+
+ case TIMESTAMP:
+ return
+ Expressions.convert_(
+ Expressions.call(BuiltInMethod.FLOOR_DIV.method,
+ operand, Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
+ int.class);
+
+ case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_DATE.method,
+ operand,
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+
+ default:
+ return defaultExpression.get();
+ }
+ }
+
private Expression translateCastToTime(RelDataType sourceType,
- Expression operand, Supplier<Expression> defaultExpression) {
+ Expression operand, ConstantExpression format, Supplier<Expression>
defaultExpression) {
+
switch (sourceType.getSqlTypeName()) {
case CHAR:
case VARCHAR:
- return Expressions.call(BuiltInMethod.STRING_TO_TIME.method, operand);
+ // If format string is supplied, parse formatted string into time
+ return Expressions.isConstantNull(format)
+ ? Expressions.call(BuiltInMethod.STRING_TO_TIME.method, operand)
+ :
Expressions.call(Expressions.new_(BuiltInMethod.PARSE_TIME.method.getDeclaringClass()),
+ BuiltInMethod.PARSE_TIME.method, format, operand);
case TIME_WITH_LOCAL_TIME_ZONE:
- return RexImpTable.optimize2(operand,
- Expressions.call(
- BuiltInMethod.TIME_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
- operand,
- Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod.TIME_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
+ operand,
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
case TIMESTAMP:
- return Expressions.convert_(
- Expressions.call(BuiltInMethod.FLOOR_MOD.method,
- operand,
- Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
- int.class);
+ return
+ Expressions.convert_(
+ Expressions.call(BuiltInMethod.FLOOR_MOD.method,
+ operand,
+ Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
+ int.class);
+
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
- return RexImpTable.optimize2(operand,
- Expressions.call(
- BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
- operand,
- Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
+ operand,
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
default:
return defaultExpression.get();
}
}
- private Expression translateCastToDate(RelDataType sourceType,
+ private Expression translateCastToTimeWithLocalTimeZone(RelDataType
sourceType,
Expression operand, Supplier<Expression> defaultExpression) {
+
switch (sourceType.getSqlTypeName()) {
case CHAR:
case VARCHAR:
- return Expressions.call(BuiltInMethod.STRING_TO_DATE.method, operand);
+ return
+
Expressions.call(BuiltInMethod.STRING_TO_TIME_WITH_LOCAL_TIME_ZONE.method,
operand);
+
+ case TIME:
+ return
+
Expressions.call(BuiltInMethod.TIME_STRING_TO_TIME_WITH_LOCAL_TIME_ZONE.method,
+ RexImpTable.optimize2(operand,
+ Expressions.call(BuiltInMethod.UNIX_TIME_TO_STRING.method,
+ operand)),
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root));
case TIMESTAMP:
- return Expressions.convert_(
- Expressions.call(BuiltInMethod.FLOOR_DIV.method,
- operand, Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
- int.class);
+ return
+
Expressions.call(BuiltInMethod.TIMESTAMP_STRING_TO_TIMESTAMP_WITH_LOCAL_TIME_ZONE.method,
+ RexImpTable.optimize2(operand,
+
Expressions.call(BuiltInMethod.UNIX_TIMESTAMP_TO_STRING.method,
+ operand)),
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root));
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
- return RexImpTable.optimize2(operand,
- Expressions.call(
- BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_DATE.method,
- operand,
- Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod
+
.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_TIME_WITH_LOCAL_TIME_ZONE
+ .method,
+ operand));
+
+ default:
+ return defaultExpression.get();
+ }
+ }
+
+ private Expression translateCastToTimeStamp(RelDataType sourceType,
+ Expression operand, ConstantExpression format, Supplier<Expression>
defaultExpression) {
+
+ switch (sourceType.getSqlTypeName()) {
+ case CHAR:
+ case VARCHAR:
+ // If format string is supplied, parse formatted string into timestamp
+ return Expressions.isConstantNull(format)
Review Comment:
That's right, the reason for the many switch cases are because we need to
evaluate the expressions based on each combination of source and target data
types (e.g. `CAST VARCHAR to TIME/DATE/NUMERIC..`), and each combination has an
individual `BuiltInMethod` implementation so the calls have to made explicit.
We could look at moving the method selection (based on `format` condition)
out of the returned method call, but it'll be the same number of lines to
assign the respective method under each case, so I dont think it would reduce
the clutter by much. Lack of generalizability is due to the number of cases and
individual built in methods for each case.
##########
core/src/main/java/org/apache/calcite/adapter/enumerable/RexToLixTranslator.java:
##########
@@ -647,58 +541,225 @@ private static Expression checkExpressionPadTruncate(
}
}
+ private Expression translateCastToDate(RelDataType sourceType,
+ Expression operand, ConstantExpression format,
+ Supplier<Expression> defaultExpression) {
+
+ switch (sourceType.getSqlTypeName()) {
+ case CHAR:
+ case VARCHAR:
+ // If format string is supplied, parse formatted string into date
+ return Expressions.isConstantNull(format)
+ ? Expressions.call(BuiltInMethod.STRING_TO_DATE.method, operand)
+ :
Expressions.call(Expressions.new_(BuiltInMethod.PARSE_DATE.method.getDeclaringClass()),
+ BuiltInMethod.PARSE_DATE.method, format, operand);
+
+ case TIMESTAMP:
+ return
+ Expressions.convert_(
+ Expressions.call(BuiltInMethod.FLOOR_DIV.method,
+ operand, Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
+ int.class);
+
+ case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_DATE.method,
+ operand,
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+
+ default:
+ return defaultExpression.get();
+ }
+ }
+
private Expression translateCastToTime(RelDataType sourceType,
- Expression operand, Supplier<Expression> defaultExpression) {
+ Expression operand, ConstantExpression format, Supplier<Expression>
defaultExpression) {
+
switch (sourceType.getSqlTypeName()) {
case CHAR:
case VARCHAR:
- return Expressions.call(BuiltInMethod.STRING_TO_TIME.method, operand);
+ // If format string is supplied, parse formatted string into time
+ return Expressions.isConstantNull(format)
+ ? Expressions.call(BuiltInMethod.STRING_TO_TIME.method, operand)
+ :
Expressions.call(Expressions.new_(BuiltInMethod.PARSE_TIME.method.getDeclaringClass()),
+ BuiltInMethod.PARSE_TIME.method, format, operand);
case TIME_WITH_LOCAL_TIME_ZONE:
- return RexImpTable.optimize2(operand,
- Expressions.call(
- BuiltInMethod.TIME_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
- operand,
- Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod.TIME_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
+ operand,
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
case TIMESTAMP:
- return Expressions.convert_(
- Expressions.call(BuiltInMethod.FLOOR_MOD.method,
- operand,
- Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
- int.class);
+ return
+ Expressions.convert_(
+ Expressions.call(BuiltInMethod.FLOOR_MOD.method,
+ operand,
+ Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
+ int.class);
+
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
- return RexImpTable.optimize2(operand,
- Expressions.call(
- BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
- operand,
- Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_TIME.method,
+ operand,
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
default:
return defaultExpression.get();
}
}
- private Expression translateCastToDate(RelDataType sourceType,
+ private Expression translateCastToTimeWithLocalTimeZone(RelDataType
sourceType,
Expression operand, Supplier<Expression> defaultExpression) {
+
switch (sourceType.getSqlTypeName()) {
case CHAR:
case VARCHAR:
- return Expressions.call(BuiltInMethod.STRING_TO_DATE.method, operand);
+ return
+
Expressions.call(BuiltInMethod.STRING_TO_TIME_WITH_LOCAL_TIME_ZONE.method,
operand);
+
+ case TIME:
+ return
+
Expressions.call(BuiltInMethod.TIME_STRING_TO_TIME_WITH_LOCAL_TIME_ZONE.method,
+ RexImpTable.optimize2(operand,
+ Expressions.call(BuiltInMethod.UNIX_TIME_TO_STRING.method,
+ operand)),
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root));
case TIMESTAMP:
- return Expressions.convert_(
- Expressions.call(BuiltInMethod.FLOOR_DIV.method,
- operand, Expressions.constant(DateTimeUtils.MILLIS_PER_DAY)),
- int.class);
+ return
+
Expressions.call(BuiltInMethod.TIMESTAMP_STRING_TO_TIMESTAMP_WITH_LOCAL_TIME_ZONE.method,
+ RexImpTable.optimize2(operand,
+
Expressions.call(BuiltInMethod.UNIX_TIMESTAMP_TO_STRING.method,
+ operand)),
+ Expressions.call(BuiltInMethod.TIME_ZONE.method, root));
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
- return RexImpTable.optimize2(operand,
- Expressions.call(
- BuiltInMethod.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_DATE.method,
- operand,
- Expressions.call(BuiltInMethod.TIME_ZONE.method, root)));
+ return
+ RexImpTable.optimize2(
+ operand, Expressions.call(
+ BuiltInMethod
+
.TIMESTAMP_WITH_LOCAL_TIME_ZONE_TO_TIME_WITH_LOCAL_TIME_ZONE
+ .method,
+ operand));
+
+ default:
+ return defaultExpression.get();
+ }
+ }
+
+ private Expression translateCastToTimeStamp(RelDataType sourceType,
+ Expression operand, ConstantExpression format, Supplier<Expression>
defaultExpression) {
+
+ switch (sourceType.getSqlTypeName()) {
+ case CHAR:
+ case VARCHAR:
+ // If format string is supplied, parse formatted string into timestamp
+ return Expressions.isConstantNull(format)
Review Comment:
That's right, the reason for the many switch cases are because we need to
evaluate the expressions based on each combination of source and target data
types (e.g. `CAST VARCHAR to TIME/DATE/NUMERIC..`), and each combination has an
individual `BuiltInMethod` implementation so the calls have to made explicit.
We could look at moving the method selection (based on `format` condition)
out of the returned method call, but it'll be the same number of lines to
assign the respective method under each case, so I dont think it would reduce
the clutter by much. Lack of generalizability is due to the number of cases and
individual built in methods for each case.
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