[MXP-2662](https://jira.tools.sap/browse/MXP-2662). Remove caching lo…

…okup to prevent further issues with inconsistencies

core/src/main/java/org/apache/calcite/adapter/jdbc/JdbcCatalogSchema.java

@@ -80,7 +80,7 @@ public JdbcCatalogSchema(DataSource dataSource, SqlDialect dialect,
     this.dialect = requireNonNull(dialect, "dialect");
     this.convention = requireNonNull(convention, "convention");
     this.catalog = catalog;
-    this.subSchemas = new CachingLookup<>(new IgnoreCaseLookup<JdbcSchema>() {
+    this.subSchemas = new IgnoreCaseLookup<JdbcSchema>() {
       @Override
       public @Nullable JdbcSchema get(String name) {
         try (Connection connection = dataSource.getConnection();
@@ -114,7 +114,7 @@ public Set<String> getNames(LikePattern pattern) {
         }
         return builder.build();
       }
-    });
+    };
   }
 
   public static JdbcCatalogSchema create(

core/src/main/java/org/apache/calcite/adapter/jdbc/JdbcSchema.java

@@ -88,7 +88,7 @@ public class TableNotFoundException extends RuntimeException {
   final @Nullable String schema;
   public final SqlDialect dialect;
   final JdbcConvention convention;
-  private final Lookup<Table> tables = new CachingLookup<Table>(new IgnoreCaseLookup<Table>() {
+  private final Lookup<Table> tables = new IgnoreCaseLookup<Table>() {
     @Override
     public @Nullable Table get(String name) {
       try (Stream<MetaImpl.MetaTable> s = getMetaTableStream(name)) {
@@ -102,7 +102,7 @@ public Set<String> getNames(LikePattern pattern) {
         return s.map(it -> it.tableName).collect(Collectors.toSet());
       }
     }
-  });
+  };
   private final Lookup<JdbcSchema> subSchemas = Lookup.empty();
 
   @Experimental