diff --git a/packages/sqltree/src/dumpSqlCondition.ts b/packages/sqltree/src/dumpSqlCondition.ts
index 96798e4b4..2dc2bfc83 100644
--- a/packages/sqltree/src/dumpSqlCondition.ts
+++ b/packages/sqltree/src/dumpSqlCondition.ts
@@ -68,6 +68,9 @@ export function dumpSqlCondition(dmp: SqlDumper, condition: Condition) {
       dmp.put(' ^and ');
       dumpSqlExpression(dmp, condition.right);
       break;
+    case 'expression':
+      dumpSqlExpression(dmp, condition.expr);
+      break;
     case 'in':
       dumpSqlExpression(dmp, condition.expr);
       dmp.put(' ^in (%,v)', condition.values);
diff --git a/packages/sqltree/src/types.ts b/packages/sqltree/src/types.ts
index db2b609d9..44a1e2ea7 100644
--- a/packages/sqltree/src/types.ts
+++ b/packages/sqltree/src/types.ts
@@ -57,6 +57,11 @@ export interface UnaryCondition {
   expr: Expression;
 }
 
+export interface ExpressionCondition extends UnaryCondition {
+  // not in standard SQL
+  conditionType: 'expression';
+}
+
 export interface BinaryCondition {
   conditionType: 'binary';
   operator: '=' | '!=' | '<>' | '<' | '>' | '>=' | '<=';
@@ -141,7 +146,8 @@ export type Condition =
   | NotInCondition
   | RawTemplateCondition
   | AnyColumnPassEvalOnlyCondition
-  | SpecificPredicateCondition;
+  | SpecificPredicateCondition
+  | ExpressionCondition;
 
 export interface Source {
   name?: NamedObjectInfo;