[TD-6312]<test>: add test case for last_row query in table with 100 columns

tests/pytest/query/last_row_cache.py

@@ -25,7 +25,7 @@ class TDTestCase:
 
         self.tables = 10
         self.rows = 20
-        self.columns = 5
+        self.columns = 100
         self.perfix = 't'
         self.ts = 1601481600000
     
@@ -33,8 +33,8 @@ class TDTestCase:
         print("==============step1")
         sql = "create table st(ts timestamp, "
         for i in range(self.columns - 1):
-            sql += "c%d int, " % (i + 1)
-        sql += "c5 int) tags(t1 int)"
+            sql += "c%d bigint, " % (i + 1)
+        sql += "c100 bigint) tags(t1 int)"
         tdSql.execute(sql)
         
         for i in range(self.tables):