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https://issues.apache.org/jira/browse/CALCITE-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706098#comment-17706098
]
TJ Banghart edited comment on CALCITE-3312 at 3/29/23 4:03 AM:
---------------------------------------------------------------
The problem begins in {{StandardConvertletTable.java}} when we convert a
{{TIMESTAMPDIFF}} into [datetime
arithmetic|https://github.com/apache/calcite/blob/5c7be55ffee836366dcc7fefb6adfc0b8c47465f/core/src/main/java/org/apache/calcite/sql2rel/StandardConvertletTable.java#L2131-L2140]
using {{MINUS_DATE}} followed by {{rexBuilder.makeCast}} and
{{{}rexBuilder.multiplyDivide{}}}.
If we delegate {{{}REINTERPRET{}}}'s unparse method to its single operand we
end up with some no-good expression that attempts to cast an interval to some
other type (in this case INT):
{{SELECT CAST(((TIME '15:30:00' - TIME '14:35:00')) /INT 60000 AS INT) FROM
foodmart.product}}
Perhaps we need to have a config option to prevent this type of conversion. Is
there anyway to override Calcite's default sql2rel conversions?
We could also recreate the original {{TIMESTAMPDIFF}} using the target
dialect's version of datetime subtraction but that may also require conversion
of {{TIMESTAMPDIFF}} calls to a standard form so we could easily identify
datetime subtraction (vs a series of {{{}CAST{}}}, {{REINTERPRET}} and
{{MINUS_DATE}} operators).
was (Author: tjbanghart):
The problem begins in {{StandardConvertletTable.java}} when we convert a
{{TIMESTAMPDIFF}} into [datetime
arithmetic|https://github.com/apache/calcite/blob/5c7be55ffee836366dcc7fefb6adfc0b8c47465f/core/src/main/java/org/apache/calcite/sql2rel/StandardConvertletTable.java#L2131-L2140]
using {{MINUS_DATE}} followed by {{rexBuilder.makeCast}} and
{{{}rexBuilder.multiplyDivide{}}}.
If we delegate {{{}REINTERPRET{}}}'s unparse method to its single operand we
end up with some no-good expression that attempts to cast an interval to some
other type (in this case INT):
{{SELECT CAST(((TIME '15:30:00' - TIME '14:35:00')) /INT 60000 AS INT) FROM
foodmart.product}}
Perhaps we need to have a config option to prevent this type of conversion. Is
there anyway to override Calcite's default sql2rel conversions?
We could also recreate the original {{TIMESTAMPDIFF}} using the target
dialect's version of datetime subtraction but that may also prevent conversion
of {{TIMESTAMPDIFF}} calls so we could easily identify datetime subtraction (vs
a series of {{{}CAST{}}}, {{REINTERPRET}} and {{MINUS_DATE}} operators).
> TIMESTAMPDIFF cannot be converted to SQL
> ----------------------------------------
>
> Key: CALCITE-3312
> URL: https://issues.apache.org/jira/browse/CALCITE-3312
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Pavel Gubin
> Assignee: TJ Banghart
> Priority: Major
>
> The following test in {{RelToSqlConverterTest}}:
> {code}
> @Test public void testTimestampDiff() {
> String query = "SELECT {fn TIMESTAMPDIFF(SQL_TSI_YEAR,TIMESTAMP
> '2016-01-01 00:00:00', TIMESTAMP '2017-01-01 00:00:00')}";
> String expected = "";
> sql(query).ok(expected);
> }
> {code}
> fails with:
> {noformat}
> java.lang.UnsupportedOperationException: class
> org.apache.calcite.sql.SqlSyntax$6: SPECIAL
> at org.apache.calcite.util.Util.needToImplement(Util.java:967)
> at org.apache.calcite.sql.SqlSyntax$6.unparse(SqlSyntax.java:116)
> at org.apache.calcite.sql.SqlOperator.unparse(SqlOperator.java:348)
> at org.apache.calcite.sql.SqlDialect.unparseCall(SqlDialect.java:402)
> at org.apache.calcite.sql.SqlCall.unparse(SqlCall.java:105)
> at org.apache.calcite.sql.SqlUtil.unparseBinarySyntax(SqlUtil.java:382)
> at org.apache.calcite.sql.SqlSyntax$3.unparse(SqlSyntax.java:65)
> at org.apache.calcite.sql.SqlOperator.unparse(SqlOperator.java:348)
> at org.apache.calcite.sql.SqlDialect.unparseCall(SqlDialect.java:402)
> at org.apache.calcite.sql.SqlCall.unparse(SqlCall.java:108)
> at
> org.apache.calcite.sql.fun.SqlCastFunction.unparse(SqlCastFunction.java:174)
> at org.apache.calcite.sql.SqlDialect.unparseCall(SqlDialect.java:402)
> at org.apache.calcite.sql.SqlCall.unparse(SqlCall.java:108)
> at org.apache.calcite.sql.SqlNodeList.commaList(SqlNodeList.java:121)
> at
> org.apache.calcite.sql.SqlOperator.unparseListClause(SqlOperator.java:365)
> at
> org.apache.calcite.sql.SqlOperator.unparseListClause(SqlOperator.java:354)
> at
> org.apache.calcite.sql.SqlSelectOperator.unparse(SqlSelectOperator.java:152)
> at org.apache.calcite.sql.SqlDialect.unparseCall(SqlDialect.java:402)
> at org.apache.calcite.sql.SqlSelect.unparse(SqlSelect.java:230)
> at org.apache.calcite.sql.SqlNode.toSqlString(SqlNode.java:152)
> at org.apache.calcite.sql.SqlNode.toSqlString(SqlNode.java:157)
> at
> org.apache.calcite.rel.rel2sql.RelToSqlConverterTest.toSql(RelToSqlConverterTest.java:145)
> at
> org.apache.calcite.rel.rel2sql.RelToSqlConverterTest.access$100(RelToSqlConverterTest.java:77)
> at
> org.apache.calcite.rel.rel2sql.RelToSqlConverterTest$Sql.exec(RelToSqlConverterTest.java:3634)
> at
> org.apache.calcite.rel.rel2sql.RelToSqlConverterTest$Sql.ok(RelToSqlConverterTest.java:3609)
> at
> org.apache.calcite.rel.rel2sql.RelToSqlConverterTest.testTimestampDiff(RelToSqlConverterTest.java:1942)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
> at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
> at
> com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
> at
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
> at
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
> {noformat}
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