Painless: Fix Bindings Bug (#33274)

When the change was made to the format for in the whitelist for bindings, parameters from
both the constructor and the method were combined into a single list instead of separate 
lists. The check for method parameters was being executed from the start of the combined 
list rather than the correct position. The tests for bindings used a constructor and a method 
that only used the int types so this was not caught. The test has been changed to also use 
a double type and this issue is fixed.

modules/lang-painless/src/main/java/org/elasticsearch/painless/BindingTest.java

@@ -26,7 +26,7 @@ public BindingTest(int state0, int state1) {
         this.state = state0 + state1;
     }
 
-    public int testAddWithState(int stateless) {
-        return stateless + state;
+    public int testAddWithState(int istateless, double dstateless) {
+        return istateless + state + (int)dstateless;
     }
 }

modules/lang-painless/src/main/java/org/elasticsearch/painless/lookup/PainlessLookupBuilder.java

@@ -908,7 +908,7 @@ public void addPainlessBinding(Class<?> targetClass, String methodName, Class<?>
         int methodTypeParametersSize = javaMethod.getParameterCount();
 
         for (int typeParameterIndex = 0; typeParameterIndex < methodTypeParametersSize; ++typeParameterIndex) {
-            Class<?> typeParameter = typeParameters.get(typeParameterIndex);
+            Class<?> typeParameter = typeParameters.get(constructorTypeParametersSize + typeParameterIndex);
 
             if (isValidType(typeParameter) == false) {
                 throw new IllegalArgumentException("type parameter [" + typeToCanonicalTypeName(typeParameter) + "] not found " +

modules/lang-painless/src/main/resources/org/elasticsearch/painless/spi/org.elasticsearch.txt

@@ -181,5 +181,5 @@ class org.elasticsearch.painless.FeatureTest no_import {
 
 # for testing
 static {
-  int testAddWithState(int, int, int) bound_to org.elasticsearch.painless.BindingTest
+  int testAddWithState(int, int, int, double) bound_to org.elasticsearch.painless.BindingTest
 }

modules/lang-painless/src/test/java/org/elasticsearch/painless/BindingsTests.java

@@ -28,11 +28,11 @@
 public class BindingsTests extends ScriptTestCase {
 
     public void testBasicBinding() {
-        assertEquals(15, exec("testAddWithState(4, 5, 6)"));
+        assertEquals(15, exec("testAddWithState(4, 5, 6, 0.0)"));
     }
 
     public void testRepeatedBinding() {
-        String script = "testAddWithState(4, 5, params.test)";
+        String script = "testAddWithState(4, 5, params.test, 0.0)";
         Map<String, Object> params = new HashMap<>();
         ExecutableScript.Factory factory = scriptEngine.compile(null, script, ExecutableScript.CONTEXT, Collections.emptyMap());
         ExecutableScript executableScript = factory.newInstance(params);
@@ -48,7 +48,7 @@ public void testRepeatedBinding() {
     }
 
     public void testBoundBinding() {
-        String script = "testAddWithState(4, params.bound, params.test)";
+        String script = "testAddWithState(4, params.bound, params.test, 0.0)";
         Map<String, Object> params = new HashMap<>();
         ExecutableScript.Factory factory = scriptEngine.compile(null, script, ExecutableScript.CONTEXT, Collections.emptyMap());
         ExecutableScript executableScript = factory.newInstance(params);