Revert "Record all table references in schemaStatVisitor."

This reverts commit c83288e.

core/src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java

@@ -36,15 +36,13 @@
 import com.alibaba.druid.stat.TableStat.Mode;
 import com.alibaba.druid.stat.TableStat.Relationship;
 import com.alibaba.druid.util.FnvHash;
-import org.apache.commons.lang3.tuple.Pair;
 
 import java.util.*;
 
 public class SchemaStatVisitor extends SQLASTVisitorAdapter {
     protected SchemaRepository repository;
 
     protected final List<SQLName> originalTables = new ArrayList<SQLName>();
-    protected final List<Pair<SQLName, String>> tableReferences = new ArrayList<>();
 
     protected final HashMap<TableStat.Name, TableStat> tableStats = new LinkedHashMap<TableStat.Name, TableStat>();
     protected final Map<Long, Column> columns = new LinkedHashMap<Long, Column>();
@@ -125,10 +123,6 @@ public TableStat getTableStat(String tableName) {
         return stat;
     }
 
-    public List<Pair<SQLName, String>> getTableReferences() {
-        return tableReferences;
-    }
-
     public TableStat getTableStat(SQLName tableName) {
         String strName;
         if (tableName instanceof SQLIdentifierExpr) {
@@ -1978,11 +1972,6 @@ public TableStat getTableStat(SQLExprTableSource tableSource) {
                 tableSource.getExpr());
     }
 
-    protected void recordTableReference(SQLExprTableSource x) {
-        if (x.getExpr() instanceof SQLName) {
-            tableReferences.add(Pair.of(((SQLName) x.getExpr()), x.getAlias()));
-        }
-    }
     protected TableStat getTableStatWithUnwrap(SQLExpr expr) {
         SQLExpr identExpr = null;
 
@@ -2034,7 +2023,6 @@ public boolean visit(SQLExprTableSource x) {
         }
 
         if (isSimpleExprTableSource(x)) {
-            recordTableReference(x);
             TableStat stat = getTableStatWithUnwrap(expr);
             if (stat == null) {
                 return false;