improve the TimeSeriesRange fromString()

antlr/src/main/antlr4/cn/edu/tsinghua/iginx/sql/Sql.g4

@@ -813,7 +813,7 @@ NAME_CHAR
     ;
 
 fragment CN_CHAR
-  : '\u2E80'..'\u9FFF'
+  : '\u2E85'..'\u9FFF'
   ;
 
 DOUBLE_QUOTE_STRING_LITERAL

core/src/main/java/cn/edu/tsinghua/iginx/metadata/entity/TimeSeriesRange.java

@@ -22,6 +22,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static cn.edu.tsinghua.iginx.utils.StringUtils.isContainSpecialChar;
+
 @JSONType(seeAlso = {TimeSeriesInterval.class, TimeSeriesPrefixRange.class}, typeKey = "type")
 public interface TimeSeriesRange extends Comparable<TimeSeriesRange> {
 
@@ -101,10 +103,21 @@ default public boolean isAfter(String tsName) {
     public void setClosed(boolean closed);
 
     //Strange function: it should not work on the implementation of TimeSeriesPrefixRange
-    public static TimeSeriesRange fromString(String str) {
-        String[] parts = str.split("-");
-        assert parts.length == 2;
-        return new TimeSeriesInterval(parts[0].equals("null") ? null : parts[0], parts[1].equals("null") ? null : parts[1]);
+    public static TimeSeriesRange fromString(String str) throws Exception {
+        if (str.contains("-") && !isContainSpecialChar(str)) {
+            String[] parts = str.split("-");
+            assert parts.length == 2;
+            return new TimeSeriesInterval(parts[0].equals("null") ? null : parts[0], parts[1].equals("null") ? null : parts[1]);
+        } else {
+            if (str.contains(".*") && str.indexOf(".*") == str.length() - 2)
+                str = str.substring(0, str.length()-2);
+            if(!isContainSpecialChar(str))
+                return new TimeSeriesPrefixRange(str);
+            else {
+                logger.error("Input invalid string format in TimeSeriesRange");
+                throw new Exception("Input invalid string format in TimeSeriesRange");
+            }
+        }
     }
 
     public boolean isContain(String tsName);

shared/src/main/java/cn/edu/tsinghua/iginx/utils/StringUtils.java

@@ -20,6 +20,8 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 public class StringUtils {
 
@@ -106,4 +108,11 @@ public static String reformatColumnName(String name) {
         name = name.replaceAll("[)]", "[)]");
         return name;
     }
+
+    public static boolean isContainSpecialChar(String str) {
+        String regEx = "[~!@#$%&()+=|{}':;',<>?~]|\r|\n|\t|[\u2E80-\u2E84]";
+        Pattern p = Pattern.compile(regEx);
+        Matcher m = p.matcher(str);
+        return m.find();
+    }
 }