[Fix] add defensive code for empty family scan/get

Author: shenyunlong

src/main/java/com/alipay/oceanbase/hbase/OHTable.java

@@ -927,6 +927,9 @@ private void processColumnFilters(NavigableSet<byte[]> columnFilters,
     @Override
     public Result get(final Get get) throws IOException {
         if (get.getFamilyMap().keySet().isEmpty()) {
+            if (!FeatureSupport.isEmptyFamilySupported()) {
+                throw new FeatureNotSupportedException("empty family get not supported yet within observer version: " + ObGlobal.obVsnString());
+            }
             // check nothing, use table group;
         } else {
             checkFamilyViolation(get.getFamilyMap().keySet(), false);
@@ -1012,6 +1015,9 @@ public Result[] get(List<Get> gets) throws IOException {
     @Override
     public ResultScanner getScanner(final Scan scan) throws IOException {
         if (scan.getFamilyMap().keySet().isEmpty()) {
+            if (!FeatureSupport.isEmptyFamilySupported()) {
+                throw new FeatureNotSupportedException("empty family scan not supported yet within observer version: " + ObGlobal.obVsnString());
+            }
             // check nothing, use table group;
         } else {
             checkFamilyViolation(scan.getFamilyMap().keySet(), false);

src/main/java/com/alipay/oceanbase/hbase/util/FeatureSupport.java

@@ -0,0 +1,14 @@
+package com.alipay.oceanbase.hbase.util;
+
+import static com.alipay.oceanbase.rpc.ObGlobal.OB_VERSION;
+import static com.alipay.oceanbase.rpc.ObGlobal.calcVersion;
+
+
+public class FeatureSupport {
+    // check empty family get/scan supported
+    public static boolean isEmptyFamilySupported() {
+        return (OB_VERSION >= calcVersion(4, 2, 3, 0)
+                && OB_VERSION < calcVersion(4, 3, 0, 0))
+                || (OB_VERSION > calcVersion(4, 3, 4, 0));
+    }
+}