performance: Change the default value of pax_enable_debug to false (#1093)

When the default value of pax_enable_debug is true, some
debug logs will be printed by default. We need to set it
to false to avoid printing these logs.

Author: gongxun0928

contrib/pax_storage/expected/filter.out

@@ -1,3 +1,4 @@
+set pax_enable_debug to on;
 set pax_enable_sparse_filter = on;
 create table pax_test.null_test_t(a int, b int, c text) using pax;
 insert into pax_test.null_test_t(a) select null from generate_series(1,2)i;

contrib/pax_storage/expected/statistics_bloom_filter.out

@@ -6,6 +6,7 @@
 -- m/^LOG:  Missing statistics for column: .*/
 -- end_matchignore
 set default_table_access_method = pax;
+set pax_enable_debug to on;
 -- 
 -- Test with small group
 -- 

contrib/pax_storage/sql/filter.sql

@@ -1,3 +1,4 @@
+set pax_enable_debug to on;
 set pax_enable_sparse_filter = on;
 create table pax_test.null_test_t(a int, b int, c text) using pax;
 

contrib/pax_storage/sql/statistics_bloom_filter.sql

@@ -6,7 +6,7 @@
 -- m/^LOG:  Missing statistics for column: .*/
 -- end_matchignore
 set default_table_access_method = pax;
-
+set pax_enable_debug to on;
 -- 
 -- Test with small group
 -- 

contrib/pax_storage/src/cpp/comm/guc.cc

@@ -58,7 +58,7 @@ namespace pax {
 #define PAX_MIN_BLOOM_FILTER_WORK_MEMORY_BYTES (1 * 1024)
 #define PAX_MAX_BLOOM_FILTER_WORK_MEMORY_BYTES (INT_MAX)
 
-bool pax_enable_debug = true;
+bool pax_enable_debug = false;
 bool pax_enable_sparse_filter = true;
 bool pax_enable_row_filter = false;
 int pax_scan_reuse_buffer_size = 0;
@@ -127,8 +127,8 @@ static bool CheckDefaultStorageFormat(char **newval, void **extra,
 
 void DefineGUCs() {
   DefineCustomBoolVariable("pax_enable_debug", "enable pax debug", NULL,
-                           &pax::pax_enable_debug, true, PGC_USERSET, 0, NULL,
-                           NULL, NULL);
+                           &pax::pax_enable_debug, false, PGC_USERSET,
+                           GUC_GPDB_NEED_SYNC, NULL, NULL, NULL);
 
   DefineCustomBoolVariable("pax_enable_sparse_filter",
                            "enable pax filter, contains min/max and bloom "