jpountz commented on a change in pull request #1444:
URL: https://github.com/apache/lucene-solr/pull/1444#discussion_r412947903



##########
File path: 
lucene/expressions/src/java/org/apache/lucene/expressions/ExpressionValueSource.java
##########
@@ -42,13 +42,17 @@
     this.expression = Objects.requireNonNull(expression);
     variables = new DoubleValuesSource[expression.variables.length];
     boolean needsScores = false;
-    for (int i = 0; i < variables.length; i++) {
-      DoubleValuesSource source = 
bindings.getDoubleValuesSource(expression.variables[i]);
-      if (source == null) {
-        throw new RuntimeException("Internal error. Variable (" + 
expression.variables[i] + ") does not exist.");
+    try {
+      for (int i = 0; i < variables.length; i++) {
+        DoubleValuesSource source = 
bindings.getDoubleValuesSource(expression.variables[i]);
+        if (source == null) {
+          throw new RuntimeException("Internal error. Variable (" + 
expression.variables[i] + ") does not exist.");
+        }
+        needsScores |= source.needsScores();
+        variables[i] = source;
       }
-      needsScores |= source.needsScores();
-      variables[i] = source;
+    } catch (StackOverflowError e) {

Review comment:
       Hmm this is a pre-existing issues but catching stack overflows is 
usually a bad idea as it might leave objects in an inconsistent state. I wonder 
if it could be checked differently. Also is it ok to move the catch from 
validate() to here?




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