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Rearrange the handling of error context reports.
Remove the code in plpgsql that suppressed the innermost line of CONTEXT for messages emitted by RAISE commands. That was never more than a quick backwards-compatibility hack, and it's pretty silly in cases where the RAISE is nested in several levels of function. What's more, it violated our design theory that verbosity of error reports should be controlled on the client side not the server side. To alleviate the resulting noise increase, introduce a feature in libpq and psql whereby the CONTEXT field of messages can be suppressed, either always or only for non-error messages. Printing CONTEXT for errors only is now their default behavior. The actual code changes here are pretty small, but the effects on the regression test outputs are widespread. I had to edit some of the alternative expected outputs by hand; hopefully the buildfarm will soon find anything I fat-fingered. In passing, fix up (again) the output line counts in psql's various help displays. Add some commentary about how to verify them. Pavel Stehule, reviewed by Petr Jelínek, Jeevan Chalke, and others
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lines changed

‎contrib/dblink/expected/dblink.out

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@@ -1,4 +1,6 @@
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CREATE EXTENSION dblink;
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-- want context for notices
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\set SHOW_CONTEXT always
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CREATE TABLE foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
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INSERT INTO foo VALUES (0,'a','{"a0","b0","c0"}');
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INSERT INTO foo VALUES (1,'b','{"a1","b1","c1"}');

‎contrib/dblink/sql/dblink.sql

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@@ -1,5 +1,8 @@
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CREATE EXTENSION dblink;
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-- want context for notices
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\set SHOW_CONTEXT always
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CREATE TABLE foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
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INSERT INTO foo VALUES (0,'a','{"a0","b0","c0"}');
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INSERT INTO foo VALUES (1,'b','{"a1","b1","c1"}');

‎contrib/hstore_plperl/expected/hstore_plperlu.out

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@@ -29,7 +29,6 @@ INFO: $VAR1 = {
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'cc' => undef
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};
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CONTEXT: PL/Perl function "test1"
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test1
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-------
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2
@@ -46,7 +45,6 @@ $$;
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SELECT test1none('aa=>bb, cc=>NULL'::hstore);
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INFO: $VAR1 = '"aa"=>"bb", "cc"=>NULL';
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CONTEXT: PL/Perl function "test1none"
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test1none
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-----------
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0
@@ -67,7 +65,6 @@ INFO: $VAR1 = {
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'cc' => undef
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};
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CONTEXT: PL/Perl function "test1list"
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test1list
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-----------
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'dd' => 'ee'
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};
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CONTEXT: PL/Perl function "test1arr"
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test1arr
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----------
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'cc' => undef
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};
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CONTEXT: PL/Perl function "test3"
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INFO: $VAR1 = '"a"=>"1", "b"=>"boo", "c"=>NULL';
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CONTEXT: PL/Perl function "test3"
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test3
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-------
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@@ -161,7 +155,6 @@ INFO: $VAR1 = {
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}
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};
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CONTEXT: PL/Perl function "test4"
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SELECT * FROM test1;
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a | b
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---+---------------------------------

‎contrib/hstore_plpython/expected/hstore_plpython.out

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@@ -13,7 +13,6 @@ return len(val)
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$$;
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SELECT test1('aa=>bb, cc=>NULL'::hstore);
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INFO: [('aa', 'bb'), ('cc', None)]
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CONTEXT: PL/Python function "test1"
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test1
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-------
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$$;
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SELECT test1n('aa=>bb, cc=>NULL'::hstore);
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INFO: [('aa', 'bb'), ('cc', None)]
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CONTEXT: PL/Python function "test1n"
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test1n
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--------
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2

‎contrib/ltree_plpython/expected/ltree_plpython.out

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$$;
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SELECT test1('aa.bb.cc'::ltree);
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INFO: ['aa', 'bb', 'cc']
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CONTEXT: PL/Python function "test1"
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test1
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-------
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$$;
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SELECT test1n('aa.bb.cc'::ltree);
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INFO: ['aa', 'bb', 'cc']
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CONTEXT: PL/Python function "test1n"
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test1n
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--------
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3

‎contrib/sepgsql/expected/alter.out

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@@ -166,15 +166,10 @@ LINE 1: ..."regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(p...
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^
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QUERY: SELECT fk."a" FROM ONLY "regtest_schema_2"."regtest_table" fk LEFT OUTER JOIN ONLY "regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(pg_catalog.=) fk."a") WHERE pk."x" IS NULL AND (fk."a" IS NOT NULL)
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LOG: SELinux: allowed { search } scontext=unconfined_u:unconfined_r:sepgsql_regtest_superuser_t:s0 tcontext=system_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="pg_catalog"
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CONTEXT: SQL statement "SELECT fk."a" FROM ONLY "regtest_schema_2"."regtest_table" fk LEFT OUTER JOIN ONLY "regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(pg_catalog.=) fk."a") WHERE pk."x" IS NULL AND (fk."a" IS NOT NULL)"
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LOG: SELinux: allowed { select } scontext=unconfined_u:unconfined_r:sepgsql_regtest_superuser_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_table name="regtest_schema_2.regtest_table"
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CONTEXT: SQL statement "SELECT fk."a" FROM ONLY "regtest_schema_2"."regtest_table" fk LEFT OUTER JOIN ONLY "regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(pg_catalog.=) fk."a") WHERE pk."x" IS NULL AND (fk."a" IS NOT NULL)"
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LOG: SELinux: allowed { select } scontext=unconfined_u:unconfined_r:sepgsql_regtest_superuser_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column a"
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CONTEXT: SQL statement "SELECT fk."a" FROM ONLY "regtest_schema_2"."regtest_table" fk LEFT OUTER JOIN ONLY "regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(pg_catalog.=) fk."a") WHERE pk."x" IS NULL AND (fk."a" IS NOT NULL)"
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LOG: SELinux: allowed { select } scontext=unconfined_u:unconfined_r:sepgsql_regtest_superuser_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_table name="regtest_schema.regtest_table_3"
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CONTEXT: SQL statement "SELECT fk."a" FROM ONLY "regtest_schema_2"."regtest_table" fk LEFT OUTER JOIN ONLY "regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(pg_catalog.=) fk."a") WHERE pk."x" IS NULL AND (fk."a" IS NOT NULL)"
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LOG: SELinux: allowed { select } scontext=unconfined_u:unconfined_r:sepgsql_regtest_superuser_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_3 column x"
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CONTEXT: SQL statement "SELECT fk."a" FROM ONLY "regtest_schema_2"."regtest_table" fk LEFT OUTER JOIN ONLY "regtest_schema"."regtest_table_3" pk ON ( pk."x" OPERATOR(pg_catalog.=) fk."a") WHERE pk."x" IS NULL AND (fk."a" IS NOT NULL)"
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ALTER TABLE regtest_table ADD CONSTRAINT test_ck CHECK (b like '%abc%') NOT VALID; -- not supported
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ALTER TABLE regtest_table VALIDATE CONSTRAINT test_ck; -- not supported
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ALTER TABLE regtest_table DROP CONSTRAINT test_ck; -- not supported

‎contrib/sepgsql/expected/label.out

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@@ -136,7 +136,6 @@ SET client_min_messages = log;
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SELECT f1(); -- normal procedure
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LOG: SELinux: allowed { execute } scontext=unconfined_u:unconfined_r:sepgsql_regtest_user_t:s0 tcontext=unconfined_u:object_r:sepgsql_proc_exec_t:s0 tclass=db_procedure name="public.f1()"
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LOG: SELinux: allowed { execute } scontext=unconfined_u:unconfined_r:sepgsql_regtest_user_t:s0 tcontext=system_u:object_r:sepgsql_proc_exec_t:s0 tclass=db_procedure name="pg_catalog.sepgsql_getcon()"
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CONTEXT: SQL function "f1" statement 1
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f1
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-----------------------------------------------------
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unconfined_u:unconfined_r:sepgsql_regtest_user_t:s0
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LOG: SELinux: allowed { entrypoint } scontext=unconfined_u:unconfined_r:sepgsql_regtest_user_t:s0 tcontext=system_u:object_r:sepgsql_trusted_proc_exec_t:s0 tclass=db_procedure name="function f2()"
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LOG: SELinux: allowed { transition } scontext=unconfined_u:unconfined_r:sepgsql_regtest_user_t:s0 tcontext=unconfined_u:unconfined_r:sepgsql_trusted_proc_t:s0 tclass=process
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LOG: SELinux: allowed { execute } scontext=unconfined_u:unconfined_r:sepgsql_trusted_proc_t:s0 tcontext=system_u:object_r:sepgsql_proc_exec_t:s0 tclass=db_procedure name="pg_catalog.sepgsql_getcon()"
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CONTEXT: SQL function "f2" statement 1
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f2
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-----------------------------------------------------
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unconfined_u:unconfined_r:sepgsql_trusted_proc_t:s0

‎doc/src/sgml/libpq.sgml

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@@ -5582,6 +5582,46 @@ PGVerbosity PQsetErrorVerbosity(PGconn *conn, PGVerbosity verbosity);
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</listitem>
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</varlistentry>
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<varlistentry id="libpq-pqseterrorcontextvisibility">
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<term>
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<function>PQsetErrorContextVisibility</function>
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<indexterm>
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<primary>PQsetErrorContextVisibility</primary>
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</indexterm>
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</term>
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<listitem>
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<para>
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Determines the handling of <literal>CONTEXT</> fields in messages
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returned by <function>PQerrorMessage</>
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and <function>PQresultErrorMessage</>.
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<synopsis>
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typedef enum
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{
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PQSHOW_CONTEXT_NEVER,
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PQSHOW_CONTEXT_ERRORS,
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PQSHOW_CONTEXT_ALWAYS
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} PGContextVisibility;
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PGContextVisibility PQsetErrorContextVisibility(PGconn *conn, PGContextVisibility show_context);
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</synopsis>
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5609+
<function>PQsetErrorContextVisibility</> sets the context display mode,
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returning the connection's previous setting. This mode controls
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whether the <literal>CONTEXT</literal> field is included in messages
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(unless the verbosity setting is <firstterm>TERSE</>, in which
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case <literal>CONTEXT</> is never shown). The <firstterm>NEVER</> mode
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never includes <literal>CONTEXT</>, while <firstterm>ALWAYS</> always
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includes it if available. In <firstterm>ERRORS</> mode (the
5616+
default), <literal>CONTEXT</> fields are included only for error
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messages, not for notices and warnings. Changing this mode does not
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affect the messages available from
5619+
already-existing <structname>PGresult</> objects, only
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subsequently-created ones.
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</para>
5622+
</listitem>
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</varlistentry>
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<varlistentry id="libpq-pqtrace">
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<term>
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<function>PQtrace</function>

‎doc/src/sgml/ref/psql-ref.sgml

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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SHOW_CONTEXT</varname></term>
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<listitem>
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<para>
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This variable can be set to the
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values <literal>never</>, <literal>errors</>, or <literal>always</>
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to control whether <literal>CONTEXT</> fields are displayed in
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messages from the server. The default is <literal>errors</> (meaning
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that context will be shown in error messages, but not in notice or
3202+
warning messages). This setting has no effect
3203+
when <varname>VERBOSITY</> is set to <literal>terse</>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SINGLELINE</varname></term>
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<listitem>

‎src/bin/psql/command.c

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@@ -2029,6 +2029,7 @@ SyncVariables(void)
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/* send stuff to it, too */
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PQsetErrorVerbosity(pset.db, pset.verbosity);
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PQsetErrorContextVisibility(pset.db, pset.show_context);
20322033
}
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/*

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