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In-Reply-To: <20260415.074316.165236259583247685.ishii@postgresql.org>
From: Nadav Shatz <nadav@tailorbrands.com>
Date: Wed, 15 Apr 2026 15:17:17 +0300
Message-ID: 
 <CACeKOO3k8K0=u9AKmctyFVivrCuMtN5OdcCDXt0ew=qwbrQGcA@mail.gmail.com>
Subject: Re: Proposal: Recent mutated table tracking in memory
To: Tatsuo Ishii <ishii@postgresql.org>
Cc: pgpool-hackers@lists.postgresql.org
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Hi Tatsuo,

hank you for the detailed review. Attached patch addresses all items.

memqcache bug fix
-----------------

Good catch. The root cause: pool_set_writing_transaction() was
explicitly skipping dml_adaptive_global, so
pool_is_writing_transaction() always returned false in this mode.
The query cache fetch guard at pool_proto_modules.c:270
(!pool_is_writing_transaction()) then served stale cached results
after DML in the same transaction.

Fix: pool_set_writing_transaction() now sets the flag for
dml_adaptive_global (only 'off' and 'dml_adaptive' skip it). This
ensures the query cache is properly bypassed after writes within
the same transaction.

Removed dead query parse cache code (~700 lines)
-------------------------------------------------

You're right -- pool_track_table_mutation_get_cached_parse,
pool_track_table_mutation_cache_parse, and
pool_track_table_mutation_normalize_and_hash were never called.
These were leftover from an earlier design where we planned to
cache SQL parse results in shared memory. The feature ended up
using pgpool's existing parser directly, and this code was never
wired up.

Removed: QueryParseCache and QueryParseEntry structs, all related
static functions, the TRACK_TABLE_MUTATION_QUERY_SEM semaphore,
and the track_table_mutation_query_buckets /
track_table_mutation_query_parse_cache_size configuration
parameters. This also reduces shared memory usage from ~6.4 MB
to ~80 KB with default settings.

check_object_relationship_list scope
-------------------------------------

You're correct -- dml_adaptive_global does not use
dml_adaptive_object_relationship_list. Changed
check_object_relationship_list() to check for DLBOW_DML_ADAPTIVE
only, not DLBOW_IS_DML_ADAPTIVE (which includes global).

Documentation fixes
-------------------

- Removed "(Lagless Replica Reads)" from section title and
  "lagless" language from description.

- Described fallback behavior when neither
  replication_delay_source_cmd nor delay_threshold_by_time is
  configured (TTL stays at 100ms default minimum).

- "query cache" references removed (the query parse cache is gone).

- Added 128-table-per-SELECT limit to Limitations section
  (uses POOL_MAX_SELECT_OIDS).

Code style fixes
----------------

- DLBOW_IS_DML_ADAPTIVE() calls no longer split across lines.

- Split the long errmsg line in
  is_select_object_in_temp_write_list.

- Removed redundant is_adaptive variable in
  is_select_object_in_temp_write_list (the check at function
  entry already guarantees it).

Thanks!

On Wed, Apr 15, 2026 at 1:43=E2=80=AFAM Tatsuo Ishii <ishii@postgresql.org>=
 wrote:

> Hi Nadav,
>
> > Hi Tatsuo,
> >
> > Looks good to me thanks!
> >
> > Please go ahead with your review. waiting to hear back from you.
>
> Here are the code review results.
>
> diff --git a/doc/src/sgml/loadbalance.sgml b/doc/src/sgml/loadbalance.sgm=
l
> index 9e1e7b39b..7384ce81a 100644
> --- a/doc/src/sgml/loadbalance.sgml
> +++ b/doc/src/sgml/loadbalance.sgml
> :
> + <sect2 id=3D"runtime-config-table-mutation-map">
> +  <title>Table Mutation Map Configuration (Lagless Replica Reads)</title=
>
>
> "(Lagless Replica Reads)" sounds like an advertisement to me. It
> should be removed.
>
> +  <para>
> +   These parameters configure the track table mutation feature, which is
> activated by setting
> +   <xref linkend=3D"guc-disable-load-balance-on-write"> to
> <literal>dml_adaptive_global</literal>.
> +   The feature tracks recently written tables to prevent stale reads fro=
m
> replica nodes during
> +   replication lag, implementing the "lagless" architecture pattern for
> distributed systems
> +   with read replicas.
>
> I think the feature does not guarantee "lagless" anytime, in all cases.
>
> +  <para>
> +   This feature requires time-based replication delay monitoring. This
> can be provided by either
> +   <xref linkend=3D"guc-replication-delay-source-cmd"> (external command
> mode) or by setting
> +   <xref linkend=3D"guc-delay-threshold-by-time"> (which uses
> <literal>pg_stat_replication.replay_lag</literal>
> +   from PostgreSQL 10+). At least one of these must be configured for th=
e
> TTL calculation to work.
>
> If one of these is not set, what happens? Error? Need to describe it.
>
> +  </para>
> +
> +  <warning>
> +   <para>
> +    Enabling <literal>dml_adaptive_global</literal> increases shared
> memory consumption. With default settings,
> +    the feature requires approximately 6.4 MB of shared memory (0.1 MB
> for table tracking + 6.3 MB for query cache).
>
> "query cache" should be "query parse cache".
>
> +    Memory usage scales with configuration parameters:
> +   </para>
> +   <itemizedlist>
> +    <listitem>
> +     <para>
> +      Table tracking: <literal>track_table_mutation_table_size * 40
> bytes</literal> (default: 2048 * 40 =3D ~80 KB)
> +     </para>
> +    </listitem>
> +    <listitem>
> +     <para>
> +      Query cache: <literal>track_table_mutation_query_parse_cache_size =
*
> 640 bytes</literal> (default: 10000 * 640 =3D ~6.3 MB)
>
> "query cache" should be "query parse cache".
>
> +   <title>Limitations</title>
>
> I think number of tables tacked in a SELECT is limited to 8. It should
> be mentioned.
>
> diff --git a/src/context/pool_query_context.c
> b/src/context/pool_query_context.c
> index a056ac596..0190d3673 100644
> --- a/src/context/pool_query_context.c
> +++ b/src/context/pool_query_context.c
> @@ -1828,15 +1829,23 @@ is_in_list(char *name, List *list)
>  static bool
>  is_select_object_in_temp_write_list(Node *node, void *context)
>  {
> -       if (node =3D=3D NULL || pool_config->disable_load_balance_on_writ=
e !=3D
> DLBOW_DML_ADAPTIVE)
> +       if (node =3D=3D NULL ||
> +               !DLBOW_IS_DML_ADAPTIVE(
> +
> pool_config->disable_load_balance_on_write))
>
> You don't need to split the line.
>
> +               is_adaptive =3D DLBOW_IS_DML_ADAPTIVE(
> +
>              pool_config->disable_load_balance_on_write);
>
> You don't need to split the line.
>
> -               if (pool_config->disable_load_balance_on_write =3D=3D
> DLBOW_DML_ADAPTIVE && session_context->is_in_transaction)
> +               if (is_adaptive &&
> +                       session_context->is_in_transaction)
>                 {
>                         ereport(DEBUG1,
>
> (errmsg("is_select_object_in_temp_write_list: \"%s\", found relation
> \"%s\"", (char *) context, rgv->relname)));
> This line is too long. Please split.
>
> @@ -1880,7 +1889,13 @@ static char
> *get_associated_object_from_dml_adaptive_relations
>  void
>  check_object_relationship_list(char *name, bool is_func_name)
>  {
> -       if (pool_config->disable_load_balance_on_write =3D=3D
> DLBOW_DML_ADAPTIVE &&
> pool_config->parsed_dml_adaptive_object_relationship_list)
> +       bool            is_adaptive;
> +
> +       is_adaptive =3D DLBOW_IS_DML_ADAPTIVE(
> +
>      pool_config->disable_load_balance_on_write);
>
> I wrote in the commit message:
>
> modifications are only detected in the same transaction). Note,
> however, you cannot use dml_adaptive_object_relationship_list to track
> dependency among table and other objects.
>
> In my understanding the feature does not use
> dml_adaptive_object_relationship_list. If this is correct, why
> check_object_relationship_list() is called here in case
> dml_adaptive_global?  If the feature uses
> dml_adaptive_object_relationship_list, test cases should be included.
>
> diff --git a/src/utils/pool_track_table_mutation.c
> b/src/utils/pool_track_table_mutation.c
> new file mode 100644
> index 000000000..9be46b28f
> --- /dev/null
> +++ b/src/utils/pool_track_table_mutation.c
>
> It seems following functions are not used anywhere. I wonder if this
> feature actually use "query parse cache".
>
> pool_track_table_mutation_get_cached_parse
> pool_track_table_mutation_cache_parse
> pool_track_table_mutation_normalize_and_hash
>
> Besides the code review, I mutated one of regression tests to check
> whether the feature co exists with in the existing memory query cache
> feature. After attached patch applied, I ran 006.memqcache and got the
> following result.
>
> cd src/test/regression
> ./regress.sh 006
> creating pgpool-II temporary installation ...
> moving pgpool_setup to temporary installation path ...
> moving watchdog_setup to temporary installation path ...
> using pgpool-II at
> /home/t-ishii/work/Pgpool-II/current/pgpool2/src/test/regression/temp/ins=
talled
> *************************
> REGRESSION MODE          : install
> Pgpool-II version        : pgpool-II version 4.8devel (mitsukakeboshi)
> Pgpool-II install path   :
> /home/t-ishii/work/Pgpool-II/current/pgpool2/src/test/regression/temp/ins=
talled
> PostgreSQL bin           : /usr/local/pgsql/bin
> PostgreSQL Major version : 18
> pgbench                  : /usr/local/pgsql/bin/pgbench
> PostgreSQL jdbc          :
> /usr/local/pgsql/share/postgresql-9.2-1003.jdbc4.jar
> *************************
> testing 006.memqcache...failed.
> out of 1 ok:0 failed:1 timeout:0
>
> log/006.memqcache shows:
>
> ../expected.txt result.txt differ: char 1, line 1
>
> So I checked the test script and found the error was generated by a
> Java program test.
>
>         java jdbctest > result.txt 2>&1
>         cmp ../expected.txt result.txt
>         if [ $? !=3D 0 ];then
>                 ./shutdownall
>                 exit 1
>         fi
>
> In jdbctest.java:
>
>                 /*
>                  * Cache test in an explicit transaction
>                  */
>                 conn.setAutoCommit(false);
>                 // execute DML. This should prevent SELECTs from using
> query cache in the transaction.
>                 sql =3D "UPDATE t1 SET i =3D 2;";
>                 pst =3D conn.createStatement();
>                 pst.executeUpdate(sql);
>                 pst.close();
>                 // should not use the cache and should return "2", rather
> than "1"
>                 prest =3D conn.prepareStatement("SELECT * FROM t1");
>                 rs =3D prest.executeQuery();
>
> The expected file (expected.txt) has "2" but the result file
> (testdir/result.txt) was "1".  This is the reason why the test
> failed. I wonder if there's something wrong with the feature when the
> query cache is enabled. Can you look into this?
>
> Regards,
> --
> Tatsuo Ishii
> SRA OSS K.K.
> English: http://www.sraoss.co.jp/index_en/
> Japanese:http://www.sraoss.co.jp
>


--=20
Nadav Shatz
Tailor Brands | CTO

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Tatsuo,<div><br></div><div>hank you for the detailed re=
view. Attached patch addresses all items.<br><br>memqcache bug fix<br>-----=
------------<br><br>Good catch. The root cause: pool_set_writing_transactio=
n() was<br>explicitly skipping dml_adaptive_global, so<br>pool_is_writing_t=
ransaction() always returned false in this mode.<br>The query cache fetch g=
uard at pool_proto_modules.c:270<br>(!pool_is_writing_transaction()) then s=
erved stale cached results<br>after DML in the same transaction.<br><br>Fix=
: pool_set_writing_transaction() now sets the flag for<br>dml_adaptive_glob=
al (only &#39;off&#39; and &#39;dml_adaptive&#39; skip it). This<br>ensures=
 the query cache is properly bypassed after writes within<br>the same trans=
action.<br><br>Removed dead query parse cache code (~700 lines)<br>--------=
-----------------------------------------<br><br>You&#39;re right -- pool_t=
rack_table_mutation_get_cached_parse,<br>pool_track_table_mutation_cache_pa=
rse, and<br>pool_track_table_mutation_normalize_and_hash were never called.=
<br>These were leftover from an earlier design where we planned to<br>cache=
 SQL parse results in shared memory. The feature ended up<br>using pgpool&#=
39;s existing parser directly, and this code was never<br>wired up.<br><br>=
Removed: QueryParseCache and QueryParseEntry structs, all related<br>static=
 functions, the TRACK_TABLE_MUTATION_QUERY_SEM semaphore,<br>and the track_=
table_mutation_query_buckets /<br>track_table_mutation_query_parse_cache_si=
ze configuration<br>parameters. This also reduces shared memory usage from =
~6.4 MB<br>to ~80 KB with default settings.<br><br>check_object_relationshi=
p_list scope<br>-------------------------------------<br><br>You&#39;re cor=
rect -- dml_adaptive_global does not use<br>dml_adaptive_object_relationshi=
p_list. Changed<br>check_object_relationship_list() to check for DLBOW_DML_=
ADAPTIVE<br>only, not DLBOW_IS_DML_ADAPTIVE (which includes global).<br><br=
>Documentation fixes<br>-------------------<br><br>- Removed &quot;(Lagless=
 Replica Reads)&quot; from section title and<br>=C2=A0 &quot;lagless&quot; =
language from description.<br><br>- Described fallback behavior when neithe=
r<br>=C2=A0 replication_delay_source_cmd nor delay_threshold_by_time is<br>=
=C2=A0 configured (TTL stays at 100ms default minimum).<br><br>- &quot;quer=
y cache&quot; references removed (the query parse cache is gone).<br><br>- =
Added 128-table-per-SELECT limit to Limitations section<br>=C2=A0 (uses POO=
L_MAX_SELECT_OIDS).<br><br>Code style fixes<br>----------------<br><br>- DL=
BOW_IS_DML_ADAPTIVE() calls no longer split across lines.<br><br>- Split th=
e long errmsg line in<br>=C2=A0 is_select_object_in_temp_write_list.<br><br=
>- Removed redundant is_adaptive variable in<br>=C2=A0 is_select_object_in_=
temp_write_list (the check at function<br>=C2=A0 entry already guarantees i=
t).<br><br>Thanks!</div></div><br><div class=3D"gmail_quote gmail_quote_con=
tainer"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Apr 15, 2026 at 1:43=
=E2=80=AFAM Tatsuo Ishii &lt;<a href=3D"mailto:ishii@postgresql.org">ishii@=
postgresql.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padd=
ing-left:1ex">Hi Nadav,<br>
<br>
&gt; Hi Tatsuo,<br>
&gt; <br>
&gt; Looks good to me thanks!<br>
&gt; <br>
&gt; Please go ahead with your review. waiting to hear back from you.<br>
<br>
Here are the code review results.<br>
<br>
diff --git a/doc/src/sgml/loadbalance.sgml b/doc/src/sgml/loadbalance.sgml<=
br>
index 9e1e7b39b..7384ce81a 100644<br>
--- a/doc/src/sgml/loadbalance.sgml<br>
+++ b/doc/src/sgml/loadbalance.sgml<br>
:<br>
+ &lt;sect2 id=3D&quot;runtime-config-table-mutation-map&quot;&gt;<br>
+=C2=A0 &lt;title&gt;Table Mutation Map Configuration (Lagless Replica Read=
s)&lt;/title&gt;<br>
<br>
&quot;(Lagless Replica Reads)&quot; sounds like an advertisement to me. It<=
br>
should be removed.<br>
<br>
+=C2=A0 &lt;para&gt;<br>
+=C2=A0 =C2=A0These parameters configure the track table mutation feature, =
which is activated by setting<br>
+=C2=A0 =C2=A0&lt;xref linkend=3D&quot;guc-disable-load-balance-on-write&qu=
ot;&gt; to &lt;literal&gt;dml_adaptive_global&lt;/literal&gt;.<br>
+=C2=A0 =C2=A0The feature tracks recently written tables to prevent stale r=
eads from replica nodes during<br>
+=C2=A0 =C2=A0replication lag, implementing the &quot;lagless&quot; archite=
cture pattern for distributed systems<br>
+=C2=A0 =C2=A0with read replicas.<br>
<br>
I think the feature does not guarantee &quot;lagless&quot; anytime, in all =
cases.<br>
<br>
+=C2=A0 &lt;para&gt;<br>
+=C2=A0 =C2=A0This feature requires time-based replication delay monitoring=
. This can be provided by either<br>
+=C2=A0 =C2=A0&lt;xref linkend=3D&quot;guc-replication-delay-source-cmd&quo=
t;&gt; (external command mode) or by setting<br>
+=C2=A0 =C2=A0&lt;xref linkend=3D&quot;guc-delay-threshold-by-time&quot;&gt=
; (which uses &lt;literal&gt;pg_stat_replication.replay_lag&lt;/literal&gt;=
<br>
+=C2=A0 =C2=A0from PostgreSQL 10+). At least one of these must be configure=
d for the TTL calculation to work.<br>
<br>
If one of these is not set, what happens? Error? Need to describe it.<br>
<br>
+=C2=A0 &lt;/para&gt;<br>
+<br>
+=C2=A0 &lt;warning&gt;<br>
+=C2=A0 =C2=A0&lt;para&gt;<br>
+=C2=A0 =C2=A0 Enabling &lt;literal&gt;dml_adaptive_global&lt;/literal&gt; =
increases shared memory consumption. With default settings,<br>
+=C2=A0 =C2=A0 the feature requires approximately 6.4 MB of shared memory (=
0.1 MB for table tracking + 6.3 MB for query cache).<br>
<br>
&quot;query cache&quot; should be &quot;query parse cache&quot;.<br>
<br>
+=C2=A0 =C2=A0 Memory usage scales with configuration parameters:<br>
+=C2=A0 =C2=A0&lt;/para&gt;<br>
+=C2=A0 =C2=A0&lt;itemizedlist&gt;<br>
+=C2=A0 =C2=A0 &lt;listitem&gt;<br>
+=C2=A0 =C2=A0 =C2=A0&lt;para&gt;<br>
+=C2=A0 =C2=A0 =C2=A0 Table tracking: &lt;literal&gt;track_table_mutation_t=
able_size * 40 bytes&lt;/literal&gt; (default: 2048 * 40 =3D ~80 KB)<br>
+=C2=A0 =C2=A0 =C2=A0&lt;/para&gt;<br>
+=C2=A0 =C2=A0 &lt;/listitem&gt;<br>
+=C2=A0 =C2=A0 &lt;listitem&gt;<br>
+=C2=A0 =C2=A0 =C2=A0&lt;para&gt;<br>
+=C2=A0 =C2=A0 =C2=A0 Query cache: &lt;literal&gt;track_table_mutation_quer=
y_parse_cache_size * 640 bytes&lt;/literal&gt; (default: 10000 * 640 =3D ~6=
.3 MB)<br>
<br>
&quot;query cache&quot; should be &quot;query parse cache&quot;.<br>
<br>
+=C2=A0 =C2=A0&lt;title&gt;Limitations&lt;/title&gt;<br>
<br>
I think number of tables tacked in a SELECT is limited to 8. It should<br>
be mentioned.<br>
<br>
diff --git a/src/context/pool_query_context.c b/src/context/pool_query_cont=
ext.c<br>
index a056ac596..0190d3673 100644<br>
--- a/src/context/pool_query_context.c<br>
+++ b/src/context/pool_query_context.c<br>
@@ -1828,15 +1829,23 @@ is_in_list(char *name, List *list)<br>
=C2=A0static bool<br>
=C2=A0is_select_object_in_temp_write_list(Node *node, void *context)<br>
=C2=A0{<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0if (node =3D=3D NULL || pool_config-&gt;disable=
_load_balance_on_write !=3D DLBOW_DML_ADAPTIVE)<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0if (node =3D=3D NULL ||<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0!DLBOW_IS_DML_ADAPT=
IVE(<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pool_config-&gt;dis=
able_load_balance_on_write))<br>
<br>
You don&#39;t need to split the line.<br>
<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is_adaptive =3D DLB=
OW_IS_DML_ADAPTIVE(<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0pool_config-&gt;disable_load_balance_on_write);<br>
<br>
You don&#39;t need to split the line. <br>
<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (pool_config-&gt=
;disable_load_balance_on_write =3D=3D DLBOW_DML_ADAPTIVE &amp;&amp; session=
_context-&gt;is_in_transaction)<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (is_adaptive &am=
p;&amp;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0session_context-&gt;is_in_transaction)<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 {<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 ereport(DEBUG1,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (errmsg(=
&quot;is_select_object_in_temp_write_list: \&quot;%s\&quot;, found relation=
 \&quot;%s\&quot;&quot;, (char *) context, rgv-&gt;relname)));<br>
This line is too long. Please split.<br>
<br>
@@ -1880,7 +1889,13 @@ static char *get_associated_object_from_dml_adaptive=
_relations<br>
=C2=A0void<br>
=C2=A0check_object_relationship_list(char *name, bool is_func_name)<br>
=C2=A0{<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0if (pool_config-&gt;disable_load_balance_on_wri=
te =3D=3D DLBOW_DML_ADAPTIVE &amp;&amp; pool_config-&gt;parsed_dml_adaptive=
_object_relationship_list)<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0bool=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 i=
s_adaptive;<br>
+<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0is_adaptive =3D DLBOW_IS_DML_ADAPTIVE(<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pool_config-&gt;=
disable_load_balance_on_write);<br>
<br>
I wrote in the commit message:<br>
<br>
modifications are only detected in the same transaction). Note,<br>
however, you cannot use dml_adaptive_object_relationship_list to track<br>
dependency among table and other objects.<br>
<br>
In my understanding the feature does not use<br>
dml_adaptive_object_relationship_list. If this is correct, why<br>
check_object_relationship_list() is called here in case<br>
dml_adaptive_global?=C2=A0 If the feature uses<br>
dml_adaptive_object_relationship_list, test cases should be included.<br>
<br>
diff --git a/src/utils/pool_track_table_mutation.c b/src/utils/pool_track_t=
able_mutation.c<br>
new file mode 100644<br>
index 000000000..9be46b28f<br>
--- /dev/null<br>
+++ b/src/utils/pool_track_table_mutation.c<br>
<br>
It seems following functions are not used anywhere. I wonder if this<br>
feature actually use &quot;query parse cache&quot;.<br>
<br>
pool_track_table_mutation_get_cached_parse<br>
pool_track_table_mutation_cache_parse<br>
pool_track_table_mutation_normalize_and_hash<br>
<br>
Besides the code review, I mutated one of regression tests to check<br>
whether the feature co exists with in the existing memory query cache<br>
feature. After attached patch applied, I ran 006.memqcache and got the<br>
following result.<br>
<br>
cd src/test/regression<br>
./regress.sh 006<br>
creating pgpool-II temporary installation ...<br>
moving pgpool_setup to temporary installation path ...<br>
moving watchdog_setup to temporary installation path ...<br>
using pgpool-II at /home/t-ishii/work/Pgpool-II/current/pgpool2/src/test/re=
gression/temp/installed<br>
*************************<br>
REGRESSION MODE=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : install<br>
Pgpool-II version=C2=A0 =C2=A0 =C2=A0 =C2=A0 : pgpool-II version 4.8devel (=
mitsukakeboshi)<br>
Pgpool-II install path=C2=A0 =C2=A0: /home/t-ishii/work/Pgpool-II/current/p=
gpool2/src/test/regression/temp/installed<br>
PostgreSQL bin=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: /usr/local/pgsql/b=
in<br>
PostgreSQL Major version : 18<br>
pgbench=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : /us=
r/local/pgsql/bin/pgbench<br>
PostgreSQL jdbc=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : /usr/local/pgsql/share/=
postgresql-9.2-1003.jdbc4.jar<br>
*************************<br>
testing 006.memqcache...failed.<br>
out of 1 ok:0 failed:1 timeout:0<br>
<br>
log/006.memqcache shows:<br>
<br>
../expected.txt result.txt differ: char 1, line 1<br>
<br>
So I checked the test script and found the error was generated by a<br>
Java program test.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 java jdbctest &gt; result.txt 2&gt;&amp;1<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 cmp ../expected.txt result.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 if [ $? !=3D 0 ];then<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ./shutdownall<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit 1<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 fi<br>
<br>
In jdbctest.java:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /*<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0* Cache test =
in an explicit transaction<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*/<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 conn.setAutoCommit(=
false);<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 // execute DML. Thi=
s should prevent SELECTs from using query cache in the transaction.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sql =3D &quot;UPDAT=
E t1 SET i =3D 2;&quot;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pst =3D conn.create=
Statement();<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pst.executeUpdate(s=
ql);<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pst.close();<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 // should not use t=
he cache and should return &quot;2&quot;, rather than &quot;1&quot;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 prest =3D conn.prep=
areStatement(&quot;SELECT * FROM t1&quot;);<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 rs =3D prest.execut=
eQuery();<br>
<br>
The expected file (expected.txt) has &quot;2&quot; but the result file<br>
(testdir/result.txt) was &quot;1&quot;.=C2=A0 This is the reason why the te=
st<br>
failed. I wonder if there&#39;s something wrong with the feature when the<b=
r>
query cache is enabled. Can you look into this?<br>
<br>
Regards,<br>
--<br>
Tatsuo Ishii<br>
SRA OSS K.K.<br>
English: <a href=3D"http://www.sraoss.co.jp/index_en/" rel=3D"noreferrer" t=
arget=3D"_blank">http://www.sraoss.co.jp/index_en/</a><br>
Japanese:<a href=3D"http://www.sraoss.co.jp" rel=3D"noreferrer" target=3D"_=
blank">http://www.sraoss.co.jp</a><br>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"rtl" class=3D"gmail_s=
ignature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"rtl"><div dir=
=3D"ltr"><font color=3D"#000000">Nadav Shatz</font></div><div dir=3D"ltr"><=
font color=3D"#000000">Tailor Brands=C2=A0| CTO</font></div></div></div></d=
iv></div></div>

--0000000000001b23fe064f7eb3d5--

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