Aklakan opened a new issue, #2883:
URL: https://github.com/apache/jena/issues/2883
### Version
5.3.0-SNAPSHOT
### What happened?
The following query fails an `OpAsQuery` roundtrip due to an NPE:
```java
@Test
public void testAlgebra04() {
String queryStr = """
SELECT * {
LATERAL {
SELECT * {
?s a ?t
FILTER EXISTS { SELECT * { ?s a ?c } }
} LIMIT 1
}
}
""";
test_roundTripAlegbra(queryStr, Syntax.syntaxARQ);
}
```
### Relevant output and stacktrace
```shell
java.lang.NullPointerException: Cannot invoke
"org.apache.jena.sparql.expr.ExprTransform.transform(org.apache.jena.sparql.expr.ExprVar)"
because "exprTransform" is null
at
org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.transformVarExprList(QueryTransformOps.java:238)
at
org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.mutateVarExprList(QueryTransformOps.java:208)
at
org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.mutateByQueryType(QueryTransformOps.java:143)
at
org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.transform(QueryTransformOps.java:72)
at
org.apache.jena.sparql.syntax.syntaxtransform.ApplyElementTransformVisitor.visit(ApplyElementTransformVisitor.java:222)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:200)
at
org.apache.jena.sparql.syntax.ElementSubQuery.visit(ElementSubQuery.java:52)
at
org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:37)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.applyTransformation(ElementTransformer.java:80)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:74)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:65)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:57)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:47)
at
org.apache.jena.sparql.syntax.syntaxtransform.ExprTransformApplyElementTransform.transform(ExprTransformApplyElementTransform.java:46)
at
org.apache.jena.sparql.expr.ExprFunctionOp.apply(ExprFunctionOp.java:86)
at
org.apache.jena.sparql.algebra.walker.ApplyTransformVisitor.visit(ApplyTransformVisitor.java:426)
at
org.apache.jena.sparql.expr.ExprFunctionOp.visit(ExprFunctionOp.java:85)
at
org.apache.jena.sparql.algebra.walker.WalkerVisitor.visit(WalkerVisitor.java:279)
at
org.apache.jena.sparql.expr.ExprFunctionOp.visit(ExprFunctionOp.java:85)
at
org.apache.jena.sparql.algebra.walker.WalkerVisitor.walk(WalkerVisitor.java:91)
at org.apache.jena.sparql.algebra.walker.Walker.walk$(Walker.java:104)
at org.apache.jena.sparql.algebra.walker.Walker.walk$(Walker.java:100)
at org.apache.jena.sparql.algebra.walker.Walker.walk(Walker.java:95)
at
org.apache.jena.sparql.algebra.walker.Walker.transform(Walker.java:211)
at
org.apache.jena.sparql.algebra.walker.Walker.transform(Walker.java:200)
at
org.apache.jena.sparql.algebra.walker.Walker.transform(Walker.java:194)
at
org.apache.jena.sparql.expr.ExprTransformer.transform(ExprTransformer.java:27)
at
org.apache.jena.sparql.syntax.syntaxtransform.ApplyElementTransformVisitor.transformExpr(ApplyElementTransformVisitor.java:241)
at
org.apache.jena.sparql.syntax.syntaxtransform.ApplyElementTransformVisitor.visit(ApplyElementTransformVisitor.java:77)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:75)
at
org.apache.jena.sparql.syntax.ElementFilter.visit(ElementFilter.java:35)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:121)
at
org.apache.jena.sparql.syntax.ElementGroup.visit(ElementGroup.java:120)
at
org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:37)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.applyTransformation(ElementTransformer.java:80)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:74)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:65)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:52)
at
org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.mutateQueryPattern(QueryTransformOps.java:90)
at
org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.transform(QueryTransformOps.java:77)
at
org.apache.jena.sparql.syntax.syntaxtransform.ApplyElementTransformVisitor.visit(ApplyElementTransformVisitor.java:222)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:200)
at
org.apache.jena.sparql.syntax.ElementSubQuery.visit(ElementSubQuery.java:52)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:121)
at
org.apache.jena.sparql.syntax.ElementGroup.visit(ElementGroup.java:120)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:139)
at
org.apache.jena.sparql.syntax.ElementLateral.visit(ElementLateral.java:59)
at
org.apache.jena.sparql.syntax.ElementWalker$EltWalker.visit(ElementWalker.java:121)
at
org.apache.jena.sparql.syntax.ElementGroup.visit(ElementGroup.java:120)
at
org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:37)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.applyTransformation(ElementTransformer.java:80)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:74)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:65)
at
org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:52)
at
org.apache.jena.sparql.algebra.OpAsQuery$Converter.fixupGroupsOfOne(OpAsQuery.java:438)
at
org.apache.jena.sparql.algebra.OpAsQuery$Converter.processQueryPattern(OpAsQuery.java:409)
at
org.apache.jena.sparql.algebra.OpAsQuery$Converter.convertInner(OpAsQuery.java:229)
at
org.apache.jena.sparql.algebra.OpAsQuery$Converter.convert(OpAsQuery.java:207)
at org.apache.jena.sparql.algebra.OpAsQuery.asQuery(OpAsQuery.java:81)
at
org.apache.jena.sparql.algebra.TestOpAsQuery.queryToQuery(TestOpAsQuery.java:674)
at
org.apache.jena.sparql.algebra.TestOpAsQuery.test_roundTripAlegbra(TestOpAsQuery.java:650)
at
org.apache.jena.sparql.algebra.TestOpAsQuery.testAlgebra04(TestOpAsQuery.java:574)
at java.base/java.lang.reflect.Method.invoke(Method.java:569)
```
### Are you interested in making a pull request?
Yes
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