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Add Support for Merge Generator in Postgres v15 #1255

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Add Support for Merge Generator in Postgres v15 #1255

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c441696
Create Merge Generator in Postgres
yaojiejia Jul 5, 2025
8306b18
Refactor Merge Generator
yaojiejia Jul 27, 2025
8289844
Fix merge generator
yaojiejia Aug 11, 2025
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10 changes: 7 additions & 3 deletions src/sqlancer/postgres/PostgresProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@
import sqlancer.postgres.gen.PostgresExplainGenerator;
import sqlancer.postgres.gen.PostgresIndexGenerator;
import sqlancer.postgres.gen.PostgresInsertGenerator;
import sqlancer.postgres.gen.PostgresMergeGenerator;
import sqlancer.postgres.gen.PostgresNotifyGenerator;
import sqlancer.postgres.gen.PostgresReindexGenerator;
import sqlancer.postgres.gen.PostgresSequenceGenerator;
Expand Down Expand Up @@ -104,6 +105,7 @@ public enum Action implements AbstractAction<PostgresGlobalState> {
DISCARD(PostgresDiscardGenerator::create), //
DROP_INDEX(PostgresDropIndexGenerator::create), //
INSERT(PostgresInsertGenerator::insert), //
MERGE(PostgresMergeGenerator::merge), //
UPDATE(PostgresUpdateGenerator::create), //
TRUNCATE(PostgresTruncateGenerator::create), //
VACUUM(PostgresVacuumGenerator::create), //
Expand Down Expand Up @@ -193,6 +195,9 @@ protected static int mapActions(PostgresGlobalState globalState, Action a) {
case UPDATE:
nrPerformed = r.getInteger(0, 10);
break;
case MERGE:
nrPerformed = r.getInteger(0, 5);
break;
case INSERT:
nrPerformed = r.getInteger(0, globalState.getOptions().getMaxNumberInserts());
break;
Expand Down Expand Up @@ -279,14 +284,13 @@ public SQLConnection createDatabase(PostgresGlobalState globalState) throws SQLE
}
Connection con = DriverManager.getConnection("jdbc:" + entryURL, username, password);
globalState.getState().logStatement(String.format("\\c %s;", entryDatabaseName));

String dropCommand = "DROP DATABASE";
boolean forceDrop = Randomly.getBoolean();
if (forceDrop) {
dropCommand += " FORCE";
}
dropCommand += " IF EXISTS " + databaseName;

globalState.getState().logStatement(dropCommand + ";");
try (Statement s = con.createStatement()) {
s.execute(dropCommand);
Expand All @@ -302,7 +306,7 @@ public SQLConnection createDatabase(PostgresGlobalState globalState) throws SQLE
throw e;
}
}

// Create database section
createDatabaseCommand = getCreateDatabaseCommand(globalState);
globalState.getState().logStatement(createDatabaseCommand + ";");
Expand Down
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