[
https://issues.apache.org/jira/browse/CALCITE-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jin Xing updated CALCITE-3536:
------------------------------
Description:
Currently, COALESCE expression specified in sql string will be rewrite to CASE
by SqlValidator [1], thus CoalesceImplementor is almost no use. But it is
actually used somewhere, for example Sum0Splitter. When running AggregateRemove
and split expression SUM0, a COALESCE is actually created and no chance to be
rewrite to CASE anymore.
In current code, CoalesceImplementor doesn't handle NullAs properly by
semantics.
If we disable the rewrite from COALESCE to CASE in Validator and run below sql
in JDBC Test:
{code:java}
select grocery_sqft from store where coalesce(grocery_sqft, 0) >= 20000{code}
We will get below exception:
{code:java}
Caused by: java.lang.RuntimeException: Error while compiling generated Java
code:
public org.apache.calcite.linq4j.Enumerable bind(final
org.apache.calcite.DataContext root) {
final org.apache.calcite.linq4j.Enumerable _inputEnumerable =
org.apache.calcite.schema.Schemas.queryable(root,
root.getRootSchema().getSubSchema("foodmart2"), java.lang.Object[].class,
"store").asEnumerable();
return new org.apache.calcite.linq4j.AbstractEnumerable(){
public org.apache.calcite.linq4j.Enumerator enumerator() {
return new org.apache.calcite.linq4j.Enumerator(){
public final org.apache.calcite.linq4j.Enumerator inputEnumerator =
_inputEnumerable.enumerator();
public void reset() {
inputEnumerator.reset();
} public boolean moveNext() {
while (inputEnumerator.moveNext()) {
final Integer inp16_ = (Integer) ((Object[])
inputEnumerator.current())[16];
if ((inp16_ ? inp16_.intValue() : 0) >= 20000) {
return true;
}
}
return false;
} public void close() {
inputEnumerator.close();
} public Object current() {
return (Integer) ((Object[]) inputEnumerator.current())[16];
} };
} };
}
at org.apache.calcite.avatica.Helper.wrap(Helper.java:37)
at org.apache.calcite.avatica.Helper.wrap(Helper.java:37)
at
org.apache.calcite.adapter.enumerable.EnumerableInterpretable.toBindable(EnumerableInterpretable.java:128)
at
org.apache.calcite.prepare.CalcitePrepareImpl$CalcitePreparingStmt.implement(CalcitePrepareImpl.java:1111)
at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:332)
at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:231)
at
org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:638)
at
org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:502)
at
org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:472)
at
org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:231)
at
org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:550)
at
org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:675)
at
org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:156)
... 29 more
Caused by: org.codehaus.commons.compiler.CompileException: Line 14, Column 28:
Not a boolean expression
at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:12211)
at org.codehaus.janino.UnitCompiler.compileBoolean2(UnitCompiler.java:3994)
at org.codehaus.janino.UnitCompiler.access$6300(UnitCompiler.java:215){code}
[1]
[https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java#L1210]
> Wrong semantics in CoalesceImplementor
> --------------------------------------
>
> Key: CALCITE-3536
> URL: https://issues.apache.org/jira/browse/CALCITE-3536
> Project: Calcite
> Issue Type: Bug
> Reporter: Jin Xing
> Priority: Major
>
> Currently, COALESCE expression specified in sql string will be rewrite to
> CASE by SqlValidator [1], thus CoalesceImplementor is almost no use. But it
> is actually used somewhere, for example Sum0Splitter. When running
> AggregateRemove and split expression SUM0, a COALESCE is actually created and
> no chance to be rewrite to CASE anymore.
> In current code, CoalesceImplementor doesn't handle NullAs properly by
> semantics.
> If we disable the rewrite from COALESCE to CASE in Validator and run below
> sql in JDBC Test:
>
> {code:java}
> select grocery_sqft from store where coalesce(grocery_sqft, 0) >= 20000{code}
>
> We will get below exception:
>
> {code:java}
> Caused by: java.lang.RuntimeException: Error while compiling generated Java
> code:
> public org.apache.calcite.linq4j.Enumerable bind(final
> org.apache.calcite.DataContext root) {
> final org.apache.calcite.linq4j.Enumerable _inputEnumerable =
> org.apache.calcite.schema.Schemas.queryable(root,
> root.getRootSchema().getSubSchema("foodmart2"), java.lang.Object[].class,
> "store").asEnumerable();
> return new org.apache.calcite.linq4j.AbstractEnumerable(){
> public org.apache.calcite.linq4j.Enumerator enumerator() {
> return new org.apache.calcite.linq4j.Enumerator(){
> public final org.apache.calcite.linq4j.Enumerator inputEnumerator
> = _inputEnumerable.enumerator();
> public void reset() {
> inputEnumerator.reset();
> } public boolean moveNext() {
> while (inputEnumerator.moveNext()) {
> final Integer inp16_ = (Integer) ((Object[])
> inputEnumerator.current())[16];
> if ((inp16_ ? inp16_.intValue() : 0) >= 20000) {
> return true;
> }
> }
> return false;
> } public void close() {
> inputEnumerator.close();
> } public Object current() {
> return (Integer) ((Object[]) inputEnumerator.current())[16];
> } };
> } };
> }
> at org.apache.calcite.avatica.Helper.wrap(Helper.java:37)
> at org.apache.calcite.avatica.Helper.wrap(Helper.java:37)
> at
> org.apache.calcite.adapter.enumerable.EnumerableInterpretable.toBindable(EnumerableInterpretable.java:128)
> at
> org.apache.calcite.prepare.CalcitePrepareImpl$CalcitePreparingStmt.implement(CalcitePrepareImpl.java:1111)
> at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:332)
> at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:231)
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:638)
>
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:502)
>
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:472)
>
> at
> org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:231)
>
> at
> org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:550)
>
> at
> org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:675)
>
> at
> org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:156)
> ... 29 more
> Caused by: org.codehaus.commons.compiler.CompileException: Line 14, Column
> 28: Not a boolean expression
> at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:12211)
> at org.codehaus.janino.UnitCompiler.compileBoolean2(UnitCompiler.java:3994)
> at org.codehaus.janino.UnitCompiler.access$6300(UnitCompiler.java:215){code}
>
>
>
> [1]
> [https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java#L1210]
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