diff --git a/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/gauss/format/processor/ExpressionProcessorUtil.java b/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/gauss/format/processor/ExpressionProcessorUtil.java
index 1f30fd24b55d77bbd8f60d188ce71ab642ceecbe..a45a45bdedc64af1b111735caf6f7b9bdb7a9fcd 100644
--- a/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/gauss/format/processor/ExpressionProcessorUtil.java
+++ b/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/gauss/format/processor/ExpressionProcessorUtil.java
@@ -40,7 +40,7 @@ public class ExpressionProcessorUtil {
     private static Map<String, List<String>> currentPreTextMap = new HashMap<>(10);
 
     static {
-        currentPreTextMap.put("=", Arrays.asList(":", ">", "<"));
+        currentPreTextMap.put("=", Arrays.asList(":", ">", "<", "!", "="));
         currentPreTextMap.put("<", Arrays.asList("=", ">"));
         currentPreTextMap.put(">", Arrays.asList("=", "<"));
         currentPreTextMap.put("!", Arrays.asList("="));