fix not null

Author: Simon Hoß

lib/query/compiler.js

@@ -109,7 +109,7 @@ class DynamoDBQueryCompiler extends QueryCompiler {
                 scanParam.ExpressionAttributeValues[`:column_${columnCount}`] = null;
                 let functionName = "attribute_not_exists";
                 if (whereItem.not) {
-                    filterExpression += `(#column_${columnCount} != :column_${columnCount}`;
+                    filterExpression += `(#column_${columnCount} <> :column_${columnCount}`;
                     functionName = "attribute_exists";
                 }
                 else {

src/query/compiler.ts

@@ -121,7 +121,7 @@ export class DynamoDBQueryCompiler extends (QueryCompiler as any) {
 
         let functionName = "attribute_not_exists";
         if (whereItem.not) {
-          filterExpression += `(#column_${columnCount} != :column_${columnCount}`;
+          filterExpression += `(#column_${columnCount} <> :column_${columnCount}`;
           functionName = "attribute_exists";
         } else {
           filterExpression += `(#column_${columnCount} = :column_${columnCount}`;

test/select.spec.ts

@@ -96,7 +96,7 @@ describe("when select", () => {
           },
           ProjectionExpression: "#project_0, #project_1",
           FilterExpression:
-            "(#column_0 != :column_0 or attribute_exists(#column_0))",
+            "(#column_0 <> :column_0 or attribute_exists(#column_0))",
           TableName: "test_test_table"
         },
         expect.anything()