sql read stmt use length(c|pad) to avoid network bandwidth limit

Author: rockeet

src/lua/oltp_common.lua

@@ -274,22 +274,22 @@ end
 local t = sysbench.sql.type
 local stmt_defs = {
    point_selects = {
-      "SELECT c FROM sbtest%u WHERE id=?",
+      "SELECT length(c) FROM sbtest%u WHERE id=?",
       t.INT},
    simple_ranges = {
-      "SELECT c FROM sbtest%u WHERE id BETWEEN ? AND ?",
+      "SELECT length(c) FROM sbtest%u WHERE id BETWEEN ? AND ?",
       t.INT, t.INT},
    secondary_ranges = {
-      "SELECT c FROM sbtest%u WHERE k >= ? AND ? >=0 LIMIT %u",
+      "SELECT length(c) FROM sbtest%u WHERE k >= ? AND ? >=0 LIMIT %u",
       t.INT, t.INT},
    sum_ranges = {
       "SELECT SUM(k) FROM sbtest%u WHERE id BETWEEN ? AND ?",
        t.INT, t.INT},
    order_ranges = {
-      "SELECT c FROM sbtest%u WHERE id BETWEEN ? AND ? ORDER BY c",
+      "SELECT length(c) as lenc FROM sbtest%u WHERE id BETWEEN ? AND ? ORDER BY lenc",
        t.INT, t.INT},
    distinct_ranges = {
-      "SELECT DISTINCT c FROM sbtest%u WHERE id BETWEEN ? AND ? ORDER BY c",
+      "SELECT DISTINCT length(c) as lenc FROM sbtest%u WHERE id BETWEEN ? AND ? ORDER BY lenc",
       t.INT, t.INT},
    index_updates = {
       "UPDATE sbtest%u SET k=k+1 WHERE id=?",

src/lua/select_random_points.lua

@@ -36,7 +36,7 @@ function thread_init()
    local points = string.rep("?, ", sysbench.opt.random_points - 1) .. "?"
 
    stmt = con:prepare(string.format([[
-        SELECT id, k, c, pad
+        SELECT id, k, length(c), length(pad)
           FROM sbtest1
           WHERE k IN (%s)
         ]], points))

tests/t/script_oltp_help.t

@@ -14,7 +14,7 @@ OLTP usage information test
     --index_updates=N             Number of UPDATE index queries per transaction [1]
     --mysql_storage_engine=STRING Storage engine, if MySQL is used [innodb]
     --non_index_updates=N         Number of UPDATE non-index queries per transaction [1]
-    --secondary_ranges=N          Number of secondary range SELECT queries per transaction [1]
+    --secondary_ranges=[0|1|2]    Secondary index to fetch table SELECT queries per transaction [1]
     --order_ranges=N              Number of SELECT ORDER BY queries per transaction [1]
     --pgsql_variant=STRING        Use this PostgreSQL variant when running with the PostgreSQL driver. The only currently supported variant is 'redshift'. When enabled, create_secondary is automatically disabled, and delete_inserts is set to 0
     --point_selects=N             Number of point SELECT queries per transaction [10]