diff --git a/fe/src/main/java/org/apache/doris/analysis/SetNamesVar.java b/fe/src/main/java/org/apache/doris/analysis/SetNamesVar.java
index 5cb180ae07..efca533da6 100644
--- a/fe/src/main/java/org/apache/doris/analysis/SetNamesVar.java
+++ b/fe/src/main/java/org/apache/doris/analysis/SetNamesVar.java
@@ -49,6 +49,10 @@ public class SetNamesVar extends SetVar {
         } else {
             charset = charset.toLowerCase();
         }
+        // utf8-superset transform to utf8
+        if (charset.startsWith(DEFAULT_NAMES)) {
+            charset = DEFAULT_NAMES;
+        }
 
         if (!charset.equalsIgnoreCase(DEFAULT_NAMES)) {
             ErrorReport.reportAnalysisException(ErrorCode.ERR_UNKNOWN_CHARACTER_SET, charset);
diff --git a/fe/src/main/java/org/apache/doris/qe/SessionVariable.java b/fe/src/main/java/org/apache/doris/qe/SessionVariable.java
index 70ffbfc5cd..63b56a0c6b 100644
--- a/fe/src/main/java/org/apache/doris/qe/SessionVariable.java
+++ b/fe/src/main/java/org/apache/doris/qe/SessionVariable.java
@@ -94,6 +94,7 @@ public class SessionVariable implements Serializable, Writable {
     public static final String REWRITE_COUNT_DISTINCT_TO_BITMAP_HLL = "rewrite_count_distinct_to_bitmap_hll";
     public static final String EVENT_SCHEDULER = "event_scheduler";
     public static final String STORAGE_ENGINE = "storage_engine";
+    public static final String DIV_PRECISION_INCREMENT = "div_precision_increment";
 
     // max memory used on every backend.
     @VariableMgr.VarAttr(name = EXEC_MEM_LIMIT)
@@ -238,6 +239,8 @@ public class SessionVariable implements Serializable, Writable {
     private String eventScheduler = "OFF";
     @VariableMgr.VarAttr(name = STORAGE_ENGINE)
     private String storageEngine = "olap";
+    @VariableMgr.VarAttr(name = DIV_PRECISION_INCREMENT)
+    private int divPrecisionIncrement = 4;
 
     public long getMaxExecMemByte() {
         return maxExecMemByte;
@@ -439,6 +442,14 @@ public class SessionVariable implements Serializable, Writable {
         this.storageEngine = storageEngine;
     }
 
+    public int getDivPrecisionIncrement() {
+        return divPrecisionIncrement;
+    }
+
+    public void setDivPrecisionIncrement(int divPrecisionIncrement) {
+        this.divPrecisionIncrement = divPrecisionIncrement;
+    }
+
     // Serialize to thrift object
     // used for rest api
     public TQueryOptions toThrift() {