Fix post-merge compilation and test failures

- Add missing import for OpenSearchSparkSqlDialect in CalcitePPLNoMvTest
  (class moved from ppl to core/validate package)
- Update CalcitePPLSpathTest.testSpathAutoExtractModeWithEval expected plan
  to match validation-deferred behavior (no eager SAFE_CAST)
- Update CalcitePPLNoMvTest.testNoMvNonExistentField to accept
  "inferred array element type" error message

Author: yuancu

core/src/main/java/org/opensearch/sql/calcite/CalcitePlanContext.java

@@ -87,7 +87,6 @@ public class CalcitePlanContext {
    */
   @Setter private static SqlOperatorTableProvider operatorTableProvider;
 
-
   private CalcitePlanContext(FrameworkConfig config, SysLimit sysLimit, QueryType queryType) {
     this.config = config;
     this.sysLimit = sysLimit;

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

@@ -13,6 +13,7 @@
 import org.apache.calcite.sql.SqlNode;
 import org.apache.calcite.test.CalciteAssert;
 import org.junit.Test;
+import org.opensearch.sql.calcite.validate.OpenSearchSparkSqlDialect;
 
 public class CalcitePPLNoMvTest extends CalcitePPLAbstractTest {
 
@@ -200,7 +201,8 @@ public void testNoMvNonExistentField() {
         msg.toLowerCase().contains("does_not_exist")
             || msg.toLowerCase().contains("field")
             || msg.contains("ARRAY_COMPACT")
-            || msg.contains("ARRAY"));
+            || msg.contains("ARRAY")
+            || msg.contains("inferred array element type"));
   }
 
   @Test

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

@@ -65,13 +65,11 @@ public void testSpathAutoExtractModeWithEval() {
             "source=EMP | spath input=ENAME output=result"
                 + " | eval age = result.user.age + 1 | fields age")
         .expectLogical(
-            "LogicalProject(age=[+(SAFE_CAST(ITEM(JSON_EXTRACT_ALL($1),"
-                + " 'user.age')), 1.0E0)])\n"
+            "LogicalProject(age=[+(ITEM(JSON_EXTRACT_ALL($1),"
+                + " 'user.age'), 1)])\n"
                 + "  LogicalTableScan(table=[[scott, EMP]])\n")
         .expectSparkSQL(
-            "SELECT TRY_CAST(JSON_EXTRACT_ALL(`ENAME`)['user.age']"
-                + " AS DOUBLE) + 1.0E0 `age`\n"
-                + "FROM `scott`.`EMP`");
+            "SELECT JSON_EXTRACT_ALL(`ENAME`)['user.age'] + 1 `age`\n" + "FROM `scott`.`EMP`");
   }
 
   @Test