[fix](regression) Fix flaky test test_partial_update_2pc_schema_change (

apache#29037)

regression-test/suites/unique_with_mow_p0/partial_update/test_partial_update_2pc_schema_change.groovy

@@ -72,6 +72,7 @@ suite("test_partial_update_2pc_schema_change", "p0") {
  file 'concurrency_update3.csv'
  time 10000 // limit inflight 10s
  }
+ sql "sync;"
  qt_sql """ select * from ${tableName} order by k1;"""
 
 
@@ -153,7 +154,7 @@ suite("test_partial_update_2pc_schema_change", "p0") {
  assertEquals("success", json.Status.toLowerCase())
  }
  }
-
+ sql "sync;"
  sql """ alter table ${tableName} modify column v2 varchar(40);"""
  wait_for_schema_change()
 
@@ -165,7 +166,7 @@ suite("test_partial_update_2pc_schema_change", "p0") {
 
  sql """ alter table ${tableName} rename column v4 renamed_v4;"""
  wait_for_schema_change()
-
+ sql "sync;"
  streamLoad {
  table "${tableName}"
  set 'column_separator', ','
@@ -176,11 +177,11 @@ suite("test_partial_update_2pc_schema_change", "p0") {
  file 'concurrency_update2.csv'
  time 10000 // limit inflight 10s
  }
-
+ sql "sync;"
  qt_sql """ select * from ${tableName} order by k1;"""
 
  do_streamload_2pc(txnId, "commit", tableName)
-
+ sql "sync;"
  qt_sql """ select * from ${tableName} order by k1;"""
 
  sql "drop table if exists ${tableName};"