gianm commented on a change in pull request #7695: Add TIMESTAMPDIFF sql support
URL: https://github.com/apache/incubator-druid/pull/7695#discussion_r285815332
##########
File path:
sql/src/main/java/org/apache/druid/sql/calcite/expression/builtin/TimeArithmeticOperatorConversion.java
##########
@@ -70,44 +71,67 @@ public DruidExpression toDruidExpression(
throw new IAE("Expected 2 args, got %s", operands.size());
}
- final RexNode timeRexNode = operands.get(0);
- final RexNode shiftRexNode = operands.get(1);
+ final RexNode leftRexNode = operands.get(0);
+ final RexNode rightRexNode = operands.get(1);
- final DruidExpression timeExpr =
Expressions.toDruidExpression(plannerContext, rowSignature, timeRexNode);
- final DruidExpression shiftExpr =
Expressions.toDruidExpression(plannerContext, rowSignature, shiftRexNode);
+ final DruidExpression leftExpr =
Expressions.toDruidExpression(plannerContext, rowSignature, leftRexNode);
+ final DruidExpression rightExpr =
Expressions.toDruidExpression(plannerContext, rowSignature, rightRexNode);
- if (timeExpr == null || shiftExpr == null) {
+ if (leftExpr == null || rightExpr == null) {
return null;
}
- if (shiftRexNode.getType().getFamily() ==
SqlTypeFamily.INTERVAL_YEAR_MONTH) {
+ if (rightRexNode.getType().getFamily() ==
SqlTypeFamily.INTERVAL_YEAR_MONTH) {
// timestamp_expr { + | - } <interval_expr> (year-month interval)
// Period is a value in months.
return DruidExpression.fromExpression(
DruidExpression.functionCall(
"timestamp_shift",
- timeExpr,
- shiftExpr.map(
+ leftExpr,
+ rightExpr.map(
simpleExtraction -> null,
expression -> StringUtils.format("concat('P', %s, 'M')",
expression)
),
DruidExpression.fromExpression(DruidExpression.numberLiteral(direction > 0 ? 1
: -1))
)
);
- } else if (shiftRexNode.getType().getFamily() ==
SqlTypeFamily.INTERVAL_DAY_TIME) {
+ } else if (rightRexNode.getType().getFamily() ==
SqlTypeFamily.INTERVAL_DAY_TIME) {
// timestamp_expr { + | - } <interval_expr> (day-time interval)
// Period is a value in milliseconds. Ignore time zone.
return DruidExpression.fromExpression(
StringUtils.format(
"(%s %s %s)",
- timeExpr.getExpression(),
+ leftExpr.getExpression(),
direction > 0 ? "+" : "-",
- shiftExpr.getExpression()
+ rightExpr.getExpression()
)
);
+ } else if ((leftRexNode.getType().getFamily() == SqlTypeFamily.TIMESTAMP ||
+ leftRexNode.getType().getFamily() == SqlTypeFamily.DATE) &&
+ (rightRexNode.getType().getFamily() == SqlTypeFamily.TIMESTAMP ||
+ rightRexNode.getType().getFamily() == SqlTypeFamily.DATE)) {
+ final String exprstr;
Review comment:
Somewhere in here, please verify the `direction` is minus. (We don't expect
to be here for plus, and the generated code wouldn't make sense.) Something
like:
```java
Preconditions.checkState(direction < 0, "direction < 0");
```
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