fix(shell): update the double display.

tools/shell/src/shellEngine.c

@@ -315,7 +315,6 @@ void shellDumpFieldToFile(TdFilePtr pFile, const char *val, TAOS_FIELD *field, i
   quotationStr[0] = '\"';
   quotationStr[1] = 0;
 
-  int  n;
   char buf[TSDB_MAX_BYTES_PER_ROW];
   switch (field->type) {
     case TSDB_DATA_TYPE_BOOL:
@@ -346,15 +345,11 @@ void shellDumpFieldToFile(TdFilePtr pFile, const char *val, TAOS_FIELD *field, i
       taosFprintfFile(pFile, "%" PRIu64, *((uint64_t *)val));
       break;
     case TSDB_DATA_TYPE_FLOAT:
-      taosFprintfFile(pFile, "%.5f", GET_FLOAT_VAL(val));
+      taosFprintfFile(pFile, "%e", GET_FLOAT_VAL(val));
       break;
     case TSDB_DATA_TYPE_DOUBLE:
-      n = snprintf(buf, TSDB_MAX_BYTES_PER_ROW, "%*.9f", length, GET_DOUBLE_VAL(val));
-      if (n > TMAX(25, length)) {
-        taosFprintfFile(pFile, "%*.15e", length, GET_DOUBLE_VAL(val));
-      } else {
-        taosFprintfFile(pFile, "%s", buf);
-      }
+      snprintf(buf, TSDB_MAX_BYTES_PER_ROW, "%*.15e", 23, GET_DOUBLE_VAL(val));
+      taosFprintfFile(pFile, "%s", buf);
       break;
     case TSDB_DATA_TYPE_BINARY:
     case TSDB_DATA_TYPE_NCHAR:
@@ -510,7 +505,6 @@ void shellPrintField(const char *val, TAOS_FIELD *field, int32_t width, int32_t
     return;
   }
 
-  int  n;
   char buf[TSDB_MAX_BYTES_PER_ROW];
   switch (field->type) {
     case TSDB_DATA_TYPE_BOOL:
@@ -541,15 +535,11 @@ void shellPrintField(const char *val, TAOS_FIELD *field, int32_t width, int32_t
       printf("%*" PRIu64, width, *((uint64_t *)val));
       break;
     case TSDB_DATA_TYPE_FLOAT:
-      printf("%*ef", width, GET_FLOAT_VAL(val));
+      printf("%*e", width, GET_FLOAT_VAL(val));
       break;
     case TSDB_DATA_TYPE_DOUBLE:
-      n = snprintf(buf, TSDB_MAX_BYTES_PER_ROW, "%*.9f", width, GET_DOUBLE_VAL(val));
-      if (n > TMAX(25, width)) {
-        printf("%*.15e", width, GET_DOUBLE_VAL(val));
-      } else {
-        printf("%s", buf);
-      }
+      snprintf(buf, TSDB_MAX_BYTES_PER_ROW, "%.15e", GET_DOUBLE_VAL(val));
+      printf("%*s", width, buf);
       break;
     case TSDB_DATA_TYPE_BINARY:
     case TSDB_DATA_TYPE_NCHAR: