fix UT

Signed-off-by: xinyual <xinyual@amazon.com>

Author: xinyual

ppl/src/test/java/org/opensearch/sql/ppl/calcite/CalcitePPLAppendcolTest.java

@@ -145,9 +145,9 @@ public void testAppendcolStats() {
     verifyLogical(root, expectedLogical);
     String expectedResult =
         ""
-            + "count()=5; DEPTNO=20; avg(SAL)=2175.00\n"
-            + "count()=3; DEPTNO=10; avg(SAL)=2916.66\n"
-            + "count()=6; DEPTNO=30; avg(SAL)=1566.66\n";
+            + "count()=5; DEPTNO=20; avg(SAL)=2175.\n"
+            + "count()=3; DEPTNO=10; avg(SAL)=2916.666666\n"
+            + "count()=6; DEPTNO=30; avg(SAL)=1566.666666\n";
     verifyResult(root, expectedResult);
 
     String expectedSparkSql =
@@ -185,9 +185,9 @@ public void testAppendcolStatsOverride() {
     verifyLogical(root, expectedLogical);
     String expectedResult =
         ""
-            + "count()=5; DEPTNO=20; avg(SAL)=2175.00\n"
-            + "count()=3; DEPTNO=10; avg(SAL)=2916.66\n"
-            + "count()=6; DEPTNO=30; avg(SAL)=1566.66\n";
+            + "count()=5; DEPTNO=20; avg(SAL)=2175.\n"
+            + "count()=3; DEPTNO=10; avg(SAL)=2916.666666\n"
+            + "count()=6; DEPTNO=30; avg(SAL)=1566.666666\n";
     verifyResult(root, expectedResult);
 
     String expectedSparkSql =