Re: [Tarantool-patches] [PATCH v1 1/1] sql: remove registerTrace() from mem.c

[Mergen Imeev via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

Hi! Thank you for the review! My answer below.

On Tue, Nov 30, 2021 at 10:00:44PM +0100, Vladislav Shpilevoy wrote:
> Hi! Thanks for the patch looks good, but I would drop this 'register trace'
> entirely. Everything that uses 'printf' is dead anyway.
> 
I'm not sure about that. For example, I have executed these statements on master and on my branch:

box.execute('set session "sql_vdbe_debug" = true;')
box.execute([[select 1;]])

Result on master:

SQL: [select 1;]
VDBE Program Listing:
 103>    0 Init             0    1    0               00 Start at 1
 103>    1 Integer          1    1    0               00 r[1]=1
 103>    2 ResultRow        1    1    0               00 output=r[1]
 103>    3 Halt             0    0    0               00 
VDBE Trace:
 103>    0 Init             0    1    0               00 Start at 1
SQL-trace: select 1;
 103>    1 Integer          1    1    0               00 r[1]=1
REG[1] =  u:1
 103>    2 ResultRow        1    1    0               00 output=r[1]
REG[1] =  u:1
 103>    3 Halt             0    0    0               00 
---
- metadata:
  - name: COLUMN_1
    type: integer
  rows:
  - [1]
...


Result on the branch:

SQL: [select 1;]
VDBE Program Listing:
 103>    0 Init             0    1    0               00 Start at 1
 103>    1 Integer          1    1    0               00 r[1]=1
 103>    2 ResultRow        1    1    0               00 output=r[1]
 103>    3 Halt             0    0    0               00 
VDBE Trace:
 103>    0 Init             0    1    0               00 Start at 1
SQL-trace: select 1;
 103>    1 Integer          1    1    0               00 r[1]=1
REG[1] = integer(1)
 103>    2 ResultRow        1    1    0               00 output=r[1]
REG[1] = integer(1)
 103>    3 Halt             0    0    0               00 
---
- metadata:
  - name: COLUMN_1
    type: integer
  rows:
  - [1]
...

As you can see, the contents of REG[1] are displayed differently.

> LGTM. Drop more code or send this patch further, does not matter.