diff --git a/src/java/com/samskivert/depot/impl/operator/BaseOperator.java b/src/java/com/samskivert/depot/impl/operator/BaseOperator.java
index 7d0e066..99dbd31 100644
--- a/src/java/com/samskivert/depot/impl/operator/BaseOperator.java
+++ b/src/java/com/samskivert/depot/impl/operator/BaseOperator.java
@@ -16,7 +16,6 @@ import com.samskivert.depot.impl.expression.ArgumentExp;
  * A base class for all operators.
  */
 public abstract class BaseOperator extends ArgumentExp
-    implements SQLOperator
 {
     public static Function<Object, Long> INTEGRAL = new Function<Object, Long>() {
         public Long apply (Object o) {
diff --git a/src/java/com/samskivert/depot/impl/operator/Exists.java b/src/java/com/samskivert/depot/impl/operator/Exists.java
index bc67193..5235a71 100644
--- a/src/java/com/samskivert/depot/impl/operator/Exists.java
+++ b/src/java/com/samskivert/depot/impl/operator/Exists.java
@@ -24,13 +24,14 @@ import java.util.Collection;
 
 import com.samskivert.depot.PersistentRecord;
 import com.samskivert.depot.clause.SelectClause;
+import com.samskivert.depot.expression.SQLExpression;
 import com.samskivert.depot.impl.ExpressionVisitor;
 
 /**
  * The SQL 'exists' operator.
  */
 public class Exists
-    implements SQLOperator
+    implements SQLExpression
 {
     public Exists (SelectClause clause)
     {
diff --git a/src/java/com/samskivert/depot/impl/operator/In.java b/src/java/com/samskivert/depot/impl/operator/In.java
index 10a7b35..3148352 100644
--- a/src/java/com/samskivert/depot/impl/operator/In.java
+++ b/src/java/com/samskivert/depot/impl/operator/In.java
@@ -24,13 +24,14 @@ import java.util.Collection;
 
 import com.samskivert.depot.PersistentRecord;
 import com.samskivert.depot.expression.ColumnExp;
+import com.samskivert.depot.expression.SQLExpression;
 import com.samskivert.depot.impl.ExpressionVisitor;
 
 /**
  * The SQL 'in (...)' operator.
  */
 public class In
-    implements SQLOperator
+    implements SQLExpression
 {
     /** The maximum number of keys allowed in an IN() clause. */
     public static final int MAX_KEYS = Short.MAX_VALUE;
diff --git a/src/java/com/samskivert/depot/impl/operator/IsNull.java b/src/java/com/samskivert/depot/impl/operator/IsNull.java
index 7f3d937..0358ec5 100644
--- a/src/java/com/samskivert/depot/impl/operator/IsNull.java
+++ b/src/java/com/samskivert/depot/impl/operator/IsNull.java
@@ -24,13 +24,14 @@ import java.util.Collection;
 
 import com.samskivert.depot.PersistentRecord;
 import com.samskivert.depot.expression.ColumnExp;
+import com.samskivert.depot.expression.SQLExpression;
 import com.samskivert.depot.impl.ExpressionVisitor;
 
 /**
  * The SQL 'is null' operator.
  */
 public class IsNull
-    implements SQLOperator
+    implements SQLExpression
 {
     public IsNull (ColumnExp column)
     {
diff --git a/src/java/com/samskivert/depot/impl/operator/Not.java b/src/java/com/samskivert/depot/impl/operator/Not.java
index e7e7587..8c56ea7 100644
--- a/src/java/com/samskivert/depot/impl/operator/Not.java
+++ b/src/java/com/samskivert/depot/impl/operator/Not.java
@@ -30,7 +30,7 @@ import com.samskivert.depot.impl.ExpressionVisitor;
  * Represents the truth negation of another conditon.
  */
 public class Not
-    implements SQLOperator
+    implements SQLExpression
 {
     public Not (SQLExpression condition)
     {
diff --git a/src/java/com/samskivert/depot/impl/operator/SQLOperator.java b/src/java/com/samskivert/depot/impl/operator/SQLOperator.java
deleted file mode 100644
index d8200ac..0000000
--- a/src/java/com/samskivert/depot/impl/operator/SQLOperator.java
+++ /dev/null
@@ -1,33 +0,0 @@
-//
-// $Id$
-//
-// Depot library - a Java relational persistence library
-// Copyright (C) 2006-2008 Michael Bayne and Pär Winzell
-//
-// This library is free software; you can redistribute it and/or modify it
-// under the terms of the GNU Lesser General Public License as published
-// by the Free Software Foundation; either version 2.1 of the License, or
-// (at your option) any later version.
-//
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-// Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public
-// License along with this library; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
-package com.samskivert.depot.impl.operator;
-
-
-import com.samskivert.depot.expression.SQLExpression;
-
-/**
- * A common interface for operator hierarchies in SQL. The main purpose of breaking this out from
- * SQLExpression is to capture the recursive nature of e.g. the logical operators, which work on
- * other SQLOperators but not general SQLExpressions.
- */
-public interface SQLOperator extends SQLExpression
-{
-}
diff --git a/src/java/com/samskivert/depot/operator/Case.java b/src/java/com/samskivert/depot/operator/Case.java
index d309296..a0a0c35 100644
--- a/src/java/com/samskivert/depot/operator/Case.java
+++ b/src/java/com/samskivert/depot/operator/Case.java
@@ -28,13 +28,13 @@ import com.google.common.collect.Lists;
 import com.samskivert.depot.PersistentRecord;
 import com.samskivert.depot.expression.SQLExpression;
 import com.samskivert.depot.impl.ExpressionVisitor;
-import com.samskivert.depot.impl.operator.SQLOperator;
 import com.samskivert.util.Tuple;
 
 /**
  * The SQL 'case' operator.
  */
-public class Case implements SQLOperator
+public class Case
+    implements SQLExpression
 {
     public Case (SQLExpression... exps)
     {
diff --git a/src/java/com/samskivert/depot/operator/FullText.java b/src/java/com/samskivert/depot/operator/FullText.java
index 9a5bc3b..c9e8240 100644
--- a/src/java/com/samskivert/depot/operator/FullText.java
+++ b/src/java/com/samskivert/depot/operator/FullText.java
@@ -24,8 +24,8 @@ import java.util.Collection;
 
 import com.samskivert.depot.PersistentRecord;
 import com.samskivert.depot.expression.FluentExp;
+import com.samskivert.depot.expression.SQLExpression;
 import com.samskivert.depot.impl.ExpressionVisitor;
-import com.samskivert.depot.impl.operator.SQLOperator;
 
 /**
  * An attempt at a dialect-agnostic full-text search condition, such as MySQL's MATCH() and
@@ -34,7 +34,7 @@ import com.samskivert.depot.impl.operator.SQLOperator;
 public class FullText
 {
     public class Rank extends FluentExp
-        implements SQLOperator
+        implements SQLExpression
     {
         // from SQLExpression
         public Object accept (ExpressionVisitor<?> builder)
@@ -60,7 +60,7 @@ public class FullText
     }
 
     public class Match extends FluentExp
-        implements SQLOperator
+        implements SQLExpression
     {
         // from SQLExpression
         public Object accept (ExpressionVisitor<?> builder)