当递归谓词使用绑定变量时，递归 CTE 不起作用

Question

在 H2 中使用递归 CTE 时（我知道，实验性功能），以下查询不起作用：

Connection con = getConnection();
System.out.println("Wrong result:");
PreparedStatement stmt = con.prepareStatement(
    "WITH recursive t(f) AS ( "+
    "    SELECT 1             "+
    "    UNION ALL            "+
    "    SELECT t.f + 1       "+
    "    FROM t               "+
    "    WHERE t.f < ?        "+
    ")                        "+
    "SELECT t.f               "+
    "FROM t                   "
);
stmt.setInt(1, 10);
ResultSet rs = stmt.executeQuery();

while (rs.next())
    System.out.println(rs.getInt(1));

产生的输出是：

预期结果为：

有什么问题？

Answer 1

这是一个已知问题 (see here)。当递归查询包含绑定变量时，H2 会出现问题。以下查询不使用绑定值并按预期工作：

System.out.println("Correct result:");
rs = con.createStatement().executeQuery(
    "WITH recursive t(f) AS ( "+
    "    SELECT 1             "+
    "    UNION ALL            "+
    "    SELECT t.f + 1       "+
    "    FROM t               "+
    "    WHERE t.f < 10       "+
    ")                        "+
    "SELECT t.f               "+
    "FROM t                   "
);

while (rs.next())
    System.out.println(rs.getInt(1));

当递归谓词使用绑定变量时，递归 CTE 不起作用

Recursive CTE don't work when recursion predicate uses a bind variable

java

sql

h2

recursive-query