- Fix MDEV-13463 unescape table name during detection of table structure

  modified:   storage/connect/myconn.cpp

- Remove a few gcc warnings
  modified:   storage/connect/jmgoconn.cpp
  modified:   storage/connect/json.h
  modified:   storage/connect/tabjson.cpp

storage/connect/jmgoconn.cpp

@@ -732,7 +732,7 @@ int JMgoConn::DocUpdate(PGLOBAL g, PTDB tdbp)
 			return RC_FX;
 
 		if (env->CallBooleanMethod(job, docaddid, updlist, jkey, val))
-			return NULL;
+			return RC_OK;
 
 		env->DeleteLocalRef(jkey);
 	}	// endfor colp
@@ -742,7 +742,7 @@ int JMgoConn::DocUpdate(PGLOBAL g, PTDB tdbp)
 	jkey = env->NewStringUTF("$set");
 
 	if (env->CallBooleanMethod(job, docaddid, upd, jkey, updlist))
-		return NULL;
+		return RC_OK;
 
 	env->DeleteLocalRef(jkey);
 

storage/connect/json.h

@@ -53,6 +53,8 @@ PSZ   Serialize(PGLOBAL g, PJSON jsp, char *fn, int pretty);
 bool  SerializeArray(JOUT *js, PJAR jarp, bool b);
 bool  SerializeObject(JOUT *js, PJOB jobp);
 bool  SerializeValue(JOUT *js, PJVAL jvp);
+bool  IsNum(PSZ s);
+char *NextChr(PSZ s, char sep);
 
 /***********************************************************************/
 /* Class JOUT. Used by Serialize.                                      */

storage/connect/myconn.cpp

@@ -139,7 +139,7 @@ PQRYRES MyColumns(PGLOBAL g, THD *thd, const char *host, const char *db,
 	unsigned int length[] = {0, 4, 0, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0};
 	PCSZ    fmt;
 	char   *fld, *colname, *chset, v, buf[128], uns[16], zero[16];
-  int     i, n, nf, ncol = sizeof(buftyp) / sizeof(int);
+  int     i, n, nf = 0, ncol = sizeof(buftyp) / sizeof(int);
   int     len, type, prec, rc, k = 0;
 	bool    b;
   PQRYRES qrp;
@@ -160,7 +160,9 @@ PQRYRES MyColumns(PGLOBAL g, THD *thd, const char *host, const char *db,
     /*  Do an evaluation of the result size.                            */
     /********************************************************************/
     STRING cmd(g, 64, "SHOW FULL COLUMNS FROM ");
-    b = cmd.Append((PSZ)table);
+		b = cmd.Append('`');
+    b |= cmd.Append((PSZ)table);
+		b |= cmd.Append('`');
 
     b |= cmd.Append(" FROM ");
     b |= cmd.Append((PSZ)(db ? db : PlgGetUser(g)->DBName));

storage/connect/tabjson.cpp

@@ -54,8 +54,6 @@
 /*  External functions.                                                */
 /***********************************************************************/
 USETEMP UseTemp(void);
-bool    IsNum(PSZ s);
-char   *NextChr(PSZ s, char sep);
 char   *GetJsonNull(void);
 
 typedef struct _jncol {