SOLR-10805: Improve error handling for statistical Stream Evaluators

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/AnovaEvaluator.java

@@ -40,6 +40,11 @@ public class AnovaEvaluator extends ComplexEvaluator implements Expressible {
   }
 
   public Tuple evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() < 2) {
+      throw new IOException("ANOVA evaluator expects atleast 2 parameters found: "+subEvaluators.size());
+    }
+
     List<double[]> list = new ArrayList();
     for(StreamEvaluator subEvaluator : subEvaluators) {
       List<Number> nums = (List<Number>)subEvaluator.evaluate(tuple);

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/ConvolutionEvaluator.java

@@ -38,6 +38,12 @@ public class ConvolutionEvaluator extends ComplexEvaluator implements Expressibl
   }
 
   public List<Number> evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Convolution evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
     StreamEvaluator colEval2 = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/CorrelationEvaluator.java

@@ -37,6 +37,11 @@ public class CorrelationEvaluator extends ComplexEvaluator implements Expressibl
   }
 
   public Number evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Correlation evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
     StreamEvaluator colEval2 = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/CovarianceEvaluator.java

@@ -37,6 +37,11 @@ public class CovarianceEvaluator extends ComplexEvaluator implements Expressible
   }
 
   public Number evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Covariance evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
     StreamEvaluator colEval2 = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/DistanceEvaluator.java

@@ -38,6 +38,11 @@ public class DistanceEvaluator extends ComplexEvaluator implements Expressible {
   }
 
   public Number evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Distance evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
     StreamEvaluator colEval2 = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/FindDelayEvaluator.java

@@ -38,6 +38,11 @@ public class FindDelayEvaluator extends ComplexEvaluator implements Expressible
   }
 
   public Number evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Finddelay evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
     StreamEvaluator colEval2 = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/HistogramEvaluator.java

@@ -42,6 +42,10 @@ public class HistogramEvaluator extends ComplexEvaluator implements Expressible
 
   public List<Map> evaluate(Tuple tuple) throws IOException {
 
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Histogram evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
 
     List<Number> numbers1 = (List<Number>)colEval1.evaluate(tuple);
@@ -79,8 +83,6 @@ public class HistogramEvaluator extends ComplexEvaluator implements Expressible
     return binList;
   }
 
-
-
   @Override
   public StreamExpressionParameter toExpression(StreamFactory factory) throws IOException {
     StreamExpression expression = new StreamExpression(factory.getFunctionName(getClass()));

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/MovingAverageEvaluator.java

@@ -38,6 +38,11 @@ public class MovingAverageEvaluator extends ComplexEvaluator implements Expressi
   }
 
   public List<Number> evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Moving average evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval = subEvaluators.get(0);
     StreamEvaluator windowEval = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/RankEvaluator.java

@@ -38,6 +38,11 @@ public class RankEvaluator extends ComplexEvaluator implements Expressible {
   }
 
   public List<Number> evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 1) {
+      throw new IOException("Rank evaluator expects 1 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval = subEvaluators.get(0);
 
     List<Number> numbers = (List<Number>)colEval.evaluate(tuple);

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/ReverseEvaluator.java

@@ -37,6 +37,11 @@ public class ReverseEvaluator extends ComplexEvaluator implements Expressible {
   }
 
   public List<Number> evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 1) {
+      throw new IOException("Reverse evaluator expects 1 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator colEval1 = subEvaluators.get(0);
 
     List<Number> numbers1 = (List<Number>)colEval1.evaluate(tuple);

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/ScaleEvaluator.java

@@ -38,6 +38,11 @@ public class ScaleEvaluator extends ComplexEvaluator implements Expressible {
   }
 
   public List<Number> evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 2) {
+      throw new IOException("Scale evaluator expects 2 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator numEval = subEvaluators.get(0);
     StreamEvaluator colEval1 = subEvaluators.get(1);
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/SequenceEvaluator.java

@@ -38,6 +38,11 @@ public class SequenceEvaluator extends ComplexEvaluator implements Expressible {
   }
 
   public List<Number> evaluate(Tuple tuple) throws IOException {
+
+    if(subEvaluators.size() != 3) {
+      throw new IOException("Sequence evaluator expects 3 parameters found: "+subEvaluators.size());
+    }
+
     StreamEvaluator sizeEval = subEvaluators.get(0);
     StreamEvaluator startEval = subEvaluators.get(1);
     StreamEvaluator strideEval = subEvaluators.get(2);