SchemaStatVisitor support stat functions.

src/test/java/com/alibaba/druid/bvt/sql/schemaStat/SchemaStatTest9.java

@@ -0,0 +1,33 @@
+package com.alibaba.druid.bvt.sql.schemaStat;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.parser.SQLParserUtils;
+import com.alibaba.druid.sql.parser.SQLStatementParser;
+import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+public class SchemaStatTest9 extends TestCase {
+
+    public void test_schemaStat() throws Exception {
+        String sql = "select now() from t";
+
+        String dbType = JdbcConstants.ORACLE;
+        SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+
+        SchemaStatVisitor statVisitor = SQLUtils.createSchemaStatVisitor(dbType);
+        stmt.accept(statVisitor);
+
+//        System.out.println(statVisitor.getColumns());
+//        System.out.println(statVisitor.getGroupByColumns()); // group by
+//        System.out.println("relationships : " + statVisitor.getRelationships()); // group by
+
+        Assert.assertEquals(0, statVisitor.getColumns().size());
+        Assert.assertEquals(0, statVisitor.getConditions().size());
+        assertEquals(1, statVisitor.getFunctions().size());
+        assertEquals("now", statVisitor.getFunctions().get(0).getMethodName());
+    }
+}