Revert "Require constant() for large constants and fix a type resolving bug (#9769)"

This reverts commit cee1c3a3804d5d3c25407b3c4ac64228e9d194e3.

6 files changed, 4 insertions, 121 deletions

diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/FunctionNode.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/FunctionNode.java
index 2aedec2109b..c4f3a75f2f8 100755
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/FunctionNode.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/FunctionNode.java
@@ -5,7 +5,6 @@ import com.yahoo.searchlib.rankingexpression.Reference;
 import com.yahoo.searchlib.rankingexpression.evaluation.Context;
 import com.yahoo.searchlib.rankingexpression.evaluation.DoubleValue;
 import com.yahoo.searchlib.rankingexpression.evaluation.Value;
-import com.yahoo.searchlib.rankingexpression.transform.TensorMaxMinTransformer;
 import com.yahoo.tensor.TensorType;
 import com.yahoo.tensor.evaluation.TypeContext;
 import com.yahoo.tensor.functions.Join;
@@ -68,11 +67,6 @@ public final class FunctionNode extends CompositeNode {
 
     @Override
     public TensorType type(TypeContext<Reference> context) {
-        // Check if this node should be interpreted as tensor reduce, as this impacts the type
-        ExpressionNode thisTransformed = TensorMaxMinTransformer.transformFunctionNode(this, context);
-        if (thisTransformed != this)
-            return thisTransformed.type(context);
-
         if (arguments.expressions().size() == 0)
             return TensorType.empty;
 
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/IfNode.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/IfNode.java
index 92c6d6f8638..28dc623be72 100755
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/IfNode.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/IfNode.java
@@ -85,9 +85,7 @@ public final class IfNode extends CompositeNode {
         return trueType.dimensionwiseGeneralizationWith(falseType).orElseThrow(() ->
             new IllegalArgumentException("An if expression must produce compatible types in both " +
                                          "alternatives, but the 'true' type is " + trueType + " while the " +
-                                         "'false' type is " + falseType +
-                                         "\n'true' branch: " + trueExpression +
-                                         "\n'false' branch: " + falseExpression)
+                                         "'false' type is " + falseType)
         );
     }
 
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ReferenceNode.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ReferenceNode.java
index e15ce158e83..eb8d2229a6d 100755
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ReferenceNode.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ReferenceNode.java
@@ -95,13 +95,7 @@ public final class ReferenceNode extends CompositeNode {
 
     @Override
     public TensorType type(TypeContext<Reference> context) {
-        TensorType type = null;
-        try {
-            type = context.getType(reference);
-        }
-        catch (IllegalArgumentException e) {
-            throw new IllegalArgumentException(reference + " is invalid", e);
-        }
+        TensorType type = context.getType(reference);
         if (type == null)
             throw new IllegalArgumentException("Unknown feature '" + toString() + "'");
         return type;
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/ExpressionTransformer.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/ExpressionTransformer.java
index 31567ba120b..22d314bcb28 100644
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/ExpressionTransformer.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/ExpressionTransformer.java
@@ -10,7 +10,7 @@ import java.util.List;
 
 /**
  * Superclass of expression transformers. The scope (lifetime) of a transformer instance is a single compilation
- * of all the expressions in one rank profile.
+ * of alle the expressions in one rank profile.
  *
  * @author bratseth
  */
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TensorMaxMinTransformer.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TensorMaxMinTransformer.java
deleted file mode 100644
index 979c5b0f88c..00000000000
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TensorMaxMinTransformer.java
+++ /dev/null
@@ -1,93 +0,0 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-package com.yahoo.searchlib.rankingexpression.transform;
-
-import com.yahoo.searchlib.rankingexpression.Reference;
-import com.yahoo.searchlib.rankingexpression.rule.CompositeNode;
-import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
-import com.yahoo.searchlib.rankingexpression.rule.FunctionNode;
-import com.yahoo.searchlib.rankingexpression.rule.NameNode;
-import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
-import com.yahoo.searchlib.rankingexpression.rule.TensorFunctionNode;
-import com.yahoo.tensor.TensorType;
-import com.yahoo.tensor.evaluation.TypeContext;
-import com.yahoo.tensor.functions.Reduce;
-
-import java.util.Optional;
-
-/**
- * Transforms min(tensor,dim) and max(tensor,dim) to
- * reduce(tensor,min/max,dim). This is necessary as the backend does
- * not recognize these forms of min and max.
- *
- * @author lesters
- */
-public class TensorMaxMinTransformer<CONTEXT extends TransformContext> extends ExpressionTransformer<CONTEXT> {
-
-    @Override
-    public ExpressionNode transform(ExpressionNode node, CONTEXT context) {
-        if (node instanceof CompositeNode) {
-            node = transformChildren((CompositeNode) node, context);
-        }
-        if (node instanceof FunctionNode) {
-            node = transformFunctionNode((FunctionNode) node, context.types());
-        }
-        return node;
-    }
-
-    public static ExpressionNode transformFunctionNode(FunctionNode node, TypeContext<Reference> context) {
-        switch (node.getFunction()) {
-            case min:
-            case max:
-                return transformMaxAndMinFunctionNode(node, context);
-        }
-        return node;
-    }
-
-    /**
-     * Transforms max and min functions if the first
-     * argument returns a tensor type and the second argument is a valid
-     * dimension in the tensor.
-     */
-    private static ExpressionNode transformMaxAndMinFunctionNode(FunctionNode node, TypeContext<Reference> context) {
-        if (node.children().size() != 2) {
-            return node;
-        }
-        ExpressionNode arg1 = node.children().get(0);
-        Optional<String> dimension = dimensionName(node.children().get(1));
-        if (dimension.isPresent()) {
-            TensorType type = arg1.type(context);
-            if (type.dimension(dimension.get()).isPresent()) {
-                return replaceMaxAndMinFunction(node);
-            }
-        }
-        return node;
-    }
-
-    private static Optional<String> dimensionName(ExpressionNode node) {
-        if (node instanceof ReferenceNode) {
-            Reference reference = ((ReferenceNode)node).reference();
-            if (reference.isIdentifier())
-                return Optional.of(reference.name());
-            else
-                return Optional.empty();
-        }
-        else if (node instanceof NameNode) {
-            return Optional.of(((NameNode)node).getValue());
-        }
-        else {
-            return Optional.empty();
-        }
-    }
-
-    private static ExpressionNode replaceMaxAndMinFunction(FunctionNode node) {
-        ExpressionNode arg1 = node.children().get(0);
-        ExpressionNode arg2 = node.children().get(1);
-
-        TensorFunctionNode.TensorFunctionExpressionNode expression = TensorFunctionNode.wrapArgument(arg1);
-        Reduce.Aggregator aggregator = Reduce.Aggregator.valueOf(node.getFunction().name());
-        String dimension = ((ReferenceNode) arg2).getName();
-
-        return new TensorFunctionNode(new Reduce(expression, aggregator, dimension));
-    }
-
-}
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TransformContext.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TransformContext.java
index 0113a650277..7485ce69f98 100644
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TransformContext.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/transform/TransformContext.java
@@ -1,9 +1,7 @@
 // Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.searchlib.rankingexpression.transform;
 
-import com.yahoo.searchlib.rankingexpression.Reference;
 import com.yahoo.searchlib.rankingexpression.evaluation.Value;
-import com.yahoo.tensor.evaluation.TypeContext;
 
 import java.util.Map;
 
@@ -15,19 +13,11 @@ import java.util.Map;
 public class TransformContext {
 
     private final Map<String, Value> constants;
-    private final TypeContext<Reference> types;
 
-    public TransformContext(Map<String, Value> constants, TypeContext<Reference> types) {
+    public TransformContext(Map<String, Value> constants) {
         this.constants = constants;
-        this.types = types;
     }
 
     public Map<String, Value> constants() { return constants; }
 
-    /**
-     * Returns the types known in this context. We may have type information for references
-     * for which no value is available
-     */
-    public TypeContext<Reference> types() { return types; }
-
 }