jinxing64 opened a new pull request #1327: [CALCITE-3206] Better error message when param type incompatibility (… URL: https://github.com/apache/calcite/pull/1327 In current code, when we query like below ``` @Test public void test() { CalciteAssert.model(HR_FKUK_MODEL) .query("select * from \"events\" where \"eventid\"='123'") .returns(CalciteAssert.outputResult()); } ``` Where eventid is of INTEGER type, Calcite will throw exception as below ``` Caused by: org.codehaus.commons.compiler.CompileException: Line 13, Column 100: Cannot compare types "int" and "java.lang.String" at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:12211) at org.codehaus.janino.UnitCompiler.compileBoolean2(UnitCompiler.java:4239) at org.codehaus.janino.UnitCompiler.access$6600(UnitCompiler.java:215) at org.codehaus.janino.UnitCompiler$14.visitBinaryOperation(UnitCompiler.java:3957) at org.codehaus.janino.UnitCompiler$14.visitBinaryOperation(UnitCompiler.java:3935) at org.codehaus.janino.Java$BinaryOperation.accept(Java.java:4864) at org.codehaus.janino.UnitCompiler.compileBoolean(UnitCompiler.java:3935) at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2475) ``` It's kind of hard to understand for user to refine the sql. The exception is thrown when compiling generated code. This PR propose to do type checking when conversion from `SqlNode` to `RexNode` and give better message when exception.
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