stacktrace

org.apache.flink.api.common.InvalidProgramException: Table program cannot be compiled. This is a bug. Please file an issue.

	at org.apache.flink.api.table.runtime.FunctionCompiler$class.compile(FunctionCompiler.scala:37)
	at org.apache.flink.api.table.expressions.utils.ExpressionTestBase$TestCompiler.compile(ExpressionTestBase.scala:214)
	at org.apache.flink.api.table.expressions.utils.ExpressionTestBase$TestCompiler.compile(ExpressionTestBase.scala:216)
	at org.apache.flink.api.table.expressions.utils.ExpressionTestBase.evaluateExprs(ExpressionTestBase.scala:120)
	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.RunAfters.evaluate(RunAfters.java:33)
	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:117)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
	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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: org.codehaus.commons.compiler.CompileException: Line 1985, Column 75: Instance method "power" cannot be invoked in static context
	at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:10062)
	at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:3926)
	at org.codehaus.janino.UnitCompiler.access$6900(UnitCompiler.java:182)
	at org.codehaus.janino.UnitCompiler$10.visitMethodInvocation(UnitCompiler.java:3263)
	at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:3971)
	at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:3290)
	at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:4356)
	at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2669)
	at org.codehaus.janino.UnitCompiler.access$4500(UnitCompiler.java:182)
	at org.codehaus.janino.UnitCompiler$7.visitAssignment(UnitCompiler.java:2619)
	at org.codehaus.janino.Java$Assignment.accept(Java.java:3402)
	at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2654)
	at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1635)
	at org.codehaus.janino.UnitCompiler.access$1100(UnitCompiler.java:182)
	at org.codehaus.janino.UnitCompiler$4.visitExpressionStatement(UnitCompiler.java:936)
	at org.codehaus.janino.Java$ExpressionStatement.accept(Java.java:2094)
	at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:958)
	at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:999)
	at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:985)
	at org.codehaus.janino.UnitCompiler.access$1000(UnitCompiler.java:182)
	at org.codehaus.janino.UnitCompiler$4.visitBlock(UnitCompiler.java:935)
	at org.codehaus.janino.Java$Block.accept(Java.java:2009)
	at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:958)
	at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1737)
	at org.codehaus.janino.UnitCompiler.access$1200(UnitCompiler.java:182)
	at org.codehaus.janino.UnitCompiler$4.visitIfStatement(UnitCompiler.java:937)
	at org.codehaus.janino.Java$IfStatement.accept(Java.java:2154)
	at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:958)
	at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:999)
	at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2284)
	at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:822)
	at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:794)
	at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:504)
	at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:390)
	at org.codehaus.janino.UnitCompiler.access$400(UnitCompiler.java:182)
	at org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:344)
	at org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:1136)
	at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:351)
	at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:319)
	at org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:358)
	at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:201)
	at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:192)
	at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:84)
	at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:77)
	at org.apache.flink.api.table.runtime.FunctionCompiler$class.compile(FunctionCompiler.scala:34)
	... 30 more


Process finished with exit code 255