HHH-18296 call set client_min_messages = WARNING before dropping tables on Postgres

Signed-off-by: Gavin King <gavin@hibernate.org>

hibernate-core/src/main/java/org/hibernate/dialect/Dialect.java

@@ -2373,6 +2373,15 @@ public abstract class Dialect implements ConversionContext, TypeContributor, Fun
 		return false;
 	}
 
+	/**
+	 * A command to execute before dropping tables.
+	 *
+	 * @return A SQL statement, or {@code null}
+	 */
+	public String getBeforeDropStatement() {
+		return null;
+	}
+
 	/**
 	 * The command used to drop a table with the given name, usually
 	 * {@code drop table tab_name}.
@@ -2380,7 +2389,12 @@ public abstract class Dialect implements ConversionContext, TypeContributor, Fun
 	 * @param tableName The name of the table to drop
 	 *
 	 * @return The {@code drop table} statement as a string
+	 * 
+	 * @deprecated No longer used
+	 *
+	 * @see StandardTableExporter#getSqlDropStrings
 	 */
+	@Deprecated(since = "6.6")
 	public String getDropTableString(String tableName) {
 		final StringBuilder buf = new StringBuilder( "drop table " );
 		if ( supportsIfExistsBeforeTableName() ) {

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQLDialect.java

@@ -783,6 +783,14 @@ public class PostgreSQLDialect extends Dialect {
 		return true;
 	}
 
+	@Override
+	public String getBeforeDropStatement() {
+		// by default, the Postgres driver reports
+		// NOTICE: table "nonexistent" does not exist, skipping
+		// as a JDBC SQLWarning
+		return "set client_min_messages = WARNING";
+	}
+
 	@Override
 	public String getAlterColumnTypeString(String columnName, String columnType, String columnDefinition) {
 		// would need multiple statements to 'set not null'/'drop not null', 'set default'/'drop default', 'set generated', etc

hibernate-core/src/main/java/org/hibernate/tool/schema/internal/SchemaDropperImpl.java

@@ -63,6 +63,7 @@ import org.jboss.logging.Logger;
 
 import static org.hibernate.internal.util.collections.CollectionHelper.setOfSize;
 import static org.hibernate.tool.schema.internal.Helper.applyScript;
+import static org.hibernate.tool.schema.internal.Helper.applySqlString;
 import static org.hibernate.tool.schema.internal.Helper.applySqlStrings;
 import static org.hibernate.tool.schema.internal.Helper.createSqlStringGenerationContext;
 import static org.hibernate.tool.schema.internal.Helper.interpretFormattingEnabled;
@@ -209,6 +210,8 @@ public class SchemaDropperImpl implements SchemaDropper {
 
 		// NOTE : init commands are irrelevant for dropping...
 
+		applySqlString( dialect.getBeforeDropStatement(), formatter, options, targets );
+
 		final SqlStringGenerationContext context = createSqlStringGenerationContext( options, metadata );
 		// Reverse the list on drop to retain possible dependencies
 		dropAuxiliaryObjectsBeforeTables( metadata, options, dialect, formatter, context, targets );