rohangarg commented on code in PR #16382:
URL: https://github.com/apache/druid/pull/16382#discussion_r1595064687


##########
sql/src/test/java/org/apache/druid/sql/calcite/SqlTestFrameworkConfig.java:
##########
@@ -36,77 +39,200 @@
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 import java.util.function.Function;
 
 /**
- * Annotation to specify desired framework settings.
+ * Specifies current framework settings.
  *
- * This class provides junit rule facilities to build the framework accordingly
- * to the annotation. These rules also cache the previously created frameworks.
+ * Intended usage from tests is via the annotations:
+ *   @SqlTestFrameworkConfig.MinTopNThreshold(33)
+ *
+ * In case of annotations used; it picks up all annotations from:
+ *  * the method
+ *  * its enclosing class and its parents
+ * if none contains a specific setting the default is being taken.
+ *
+ * All configurable setting should have:
+ *   * an annotation with `value` with the desired type
+ *   * the annotation itself should be annotated with itslef to set the 
default value
+ *   * a field should be added to the main config class
  */
-@Retention(RetentionPolicy.RUNTIME)
-@Target({ElementType.METHOD})
-public @interface SqlTestFrameworkConfig
+public class SqlTestFrameworkConfig
 {
-  int numMergeBuffers() default 0;
+  @Retention(RetentionPolicy.RUNTIME)
+  @Target({ElementType.METHOD, ElementType.TYPE})
+  @NumMergeBuffers(0)
+  public @interface NumMergeBuffers
+  {
+    int value();
+  }
 
-  int minTopNThreshold() default TopNQueryConfig.DEFAULT_MIN_TOPN_THRESHOLD;
+  @Retention(RetentionPolicy.RUNTIME)
+  @Target({ElementType.METHOD, ElementType.TYPE})
+  @MinTopNThreshold(TopNQueryConfig.DEFAULT_MIN_TOPN_THRESHOLD)
+  public @interface MinTopNThreshold
+  {
+    int value();
+  }
 
-  ResultCacheMode resultCache() default ResultCacheMode.DISABLED;
+  @Retention(RetentionPolicy.RUNTIME)
+  @Target({ElementType.METHOD, ElementType.TYPE})
+  @ResultCache(ResultCacheMode.DISABLED)
+  public @interface ResultCache
+  {
+    ResultCacheMode value();
+  }
 
   /**
-   * Non-annotation version of {@link SqlTestFrameworkConfig}.
-   *
-   * Makes it less convoluted to work with configurations created at runtime.
+   * Declares which {@link QueryComponentSupplier} must be used for the class.
    */
-  class SqlTestFrameworkConfigInstance
+  @Retention(RetentionPolicy.RUNTIME)
+  @Target({ElementType.METHOD, ElementType.TYPE})
+  @Supplier(StandardComponentSupplier.class)
+  public @interface Supplier
   {
-    public final int numMergeBuffers;
-    public final int minTopNThreshold;
-    public final ResultCacheMode resultCache;
+    Class<? extends QueryComponentSupplier> value();
+  }
 
-    public SqlTestFrameworkConfigInstance(SqlTestFrameworkConfig annotation)
-    {
-      numMergeBuffers = annotation.numMergeBuffers();
-      minTopNThreshold = annotation.minTopNThreshold();
-      resultCache = annotation.resultCache();
+  public final int numMergeBuffers;
+  public final int minTopNThreshold;
+  public final ResultCacheMode resultCache;
+  public final Class<? extends QueryComponentSupplier> supplier;
+
+  public SqlTestFrameworkConfig(List<Annotation> annotations)
+  {
+    try {
+      numMergeBuffers = getValueFromAnnotation(annotations, 
NumMergeBuffers.class);
+      minTopNThreshold = getValueFromAnnotation(annotations, 
MinTopNThreshold.class);
+      resultCache = getValueFromAnnotation(annotations, ResultCache.class);
+      supplier = getValueFromAnnotation(annotations, Supplier.class);
+    }
+    catch (NoSuchMethodException | SecurityException | IllegalAccessException 
| IllegalArgumentException
+        | InvocationTargetException e) {
+      throw new RuntimeException(e);
     }
+  }
 
-    @Override
-    public int hashCode()
-    {
-      return Objects.hash(minTopNThreshold, numMergeBuffers, resultCache);
+  public SqlTestFrameworkConfig(Map<String, String> queryParams)
+  {
+    try {
+      numMergeBuffers = getValueFromMap(queryParams, NumMergeBuffers.class);
+      minTopNThreshold = getValueFromMap(queryParams, MinTopNThreshold.class);
+      resultCache = getValueFromMap(queryParams, ResultCache.class);
+      supplier = getValueFromMap(queryParams, Supplier.class);
     }
+    catch (NoSuchMethodException | SecurityException | IllegalAccessException 
| IllegalArgumentException
+        | InvocationTargetException e) {
+      throw new RuntimeException(e);
+    }
+  }
 
-    @Override
-    public boolean equals(Object obj)
-    {
-      if (obj == null || getClass() != obj.getClass()) {
-        return false;
+  @SuppressWarnings("unchecked")
+  private <T> T getValueFromMap(Map<String, String> map, Class<? extends 
Annotation> annotationClass)
+      throws IllegalAccessException, InvocationTargetException, 
NoSuchMethodException, SecurityException
+  {
+    String value = map.get(annotationClass.getSimpleName());
+    if (value == null) {
+      return defaultValue(annotationClass);
+    }
+    Class<?> type = annotationClass.getMethod("value").getReturnType();
+
+    if (type == int.class) {
+      return (T) Integer.valueOf(value);
+    }
+    if (type == Class.class) {
+
+      Object clazz = getQueryComponentSupplierForName(value);
+      if (clazz != null) {
+        return (T) clazz;
+      }
+
+    }
+    throw new RuntimeException("don't know how to handle conversion to " + 
type);
+  }
+
+  private Object getQueryComponentSupplierForName(String name)
+  {
+    Set<Class<? extends QueryComponentSupplier>> subTypes = new 
Reflections("org.apache.druid")

Review Comment:
   ah, I see. Sorry I missed that! Although, the few quidem tests we have right 
now would invoke the lookup right?
   Also, thanks for checking the time difference between the runtimes



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