improve odps sql support

src/main/java/com/alibaba/druid/sql/ast/expr/SQLArrayExpr.java

@@ -0,0 +1,67 @@
+package com.alibaba.druid.sql.ast.expr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLExprImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLArrayExpr extends SQLExprImpl {
+
+    private SQLExpr       expr;
+
+    private List<SQLExpr> values = new ArrayList<SQLExpr>();
+
+    public SQLExpr getExpr() {
+        return expr;
+    }
+
+    public void setExpr(SQLExpr expr) {
+        this.expr = expr;
+    }
+
+    public List<SQLExpr> getValues() {
+        return values;
+    }
+
+    public void setValues(List<SQLExpr> values) {
+        this.values = values;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, expr);
+            acceptChild(visitor, values);
+        }
+        visitor.endVisit(this);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        result = prime * result + ((values == null) ? 0 : values.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null) return false;
+        if (getClass() != obj.getClass()) return false;
+        SQLArrayExpr other = (SQLArrayExpr) obj;
+        if (expr == null) {
+            if (other.expr != null) return false;
+        } else if (!expr.equals(other.expr)) return false;
+        if (values == null) {
+            if (other.values != null) return false;
+        } else if (!values.equals(other.values)) return false;
+        return true;
+    }
+
+
+
+}