bug fixed for SchemaStat

src/test/java/com/alibaba/druid/sql/PGTest.java

@@ -0,0 +1,21 @@
+package com.alibaba.druid.sql;
+
+import java.util.List;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.postgresql.visitor.PGOutputVisitor;
+
+import junit.framework.TestCase;
+
+public class PGTest extends TestCase {
+	protected String output(List<SQLStatement> stmtList) {
+		StringBuilder out = new StringBuilder();
+		PGOutputVisitor visitor = new PGOutputVisitor(out);
+
+		for (SQLStatement stmt : stmtList) {
+			stmt.accept(visitor);
+		}
+
+		return out.toString();
+	}
+}