有没有办法查看Calcite JDBC执行的物理SQL？

Question

最近在研究Apache Calcite，现在我可以通过JDBC使用explain plan for查看逻辑计划，我想知道如何查看物理sql计划执行？由于物理sql代可能存在bug，所以我需要确保正确性。

    val connection = DriverManager.getConnection("jdbc:calcite:")
    val calciteConnection = connection.asInstanceOf[CalciteConnection]
    val rootSchema = calciteConnection.getRootSchema()

    val dsInsightUser = JdbcSchema.dataSource("jdbc:mysql://localhost:13306/insight?useSSL=false&serverTimezone=UTC", "com.mysql.jdbc.Driver", "insight_admin","xxxxxx")
    val dsPerm = JdbcSchema.dataSource("jdbc:mysql://localhost:13307/permission?useSSL=false&serverTimezone=UTC", "com.mysql.jdbc.Driver", "perm_admin", "xxxxxx")

    rootSchema.add("insight_user", JdbcSchema.create(rootSchema, "insight_user", dsInsightUser, null, null))
    rootSchema.add("perm", JdbcSchema.create(rootSchema, "perm", dsPerm, null, null))

    val stmt = connection.createStatement()
    val rs = stmt.executeQuery("""explain plan for select "perm"."user_table".* from "perm"."user_table" join "insight_user"."user_tab" on "perm"."user_table"."id"="insight_user"."user_tab"."id" """)
    val metaData = rs.getMetaData()

    while(rs.next()) {
      for(i <- 1 to metaData.getColumnCount) printf("%s ", rs.getObject(i))
      println()
    }

结果是

EnumerableCalc(expr#0..3=[{inputs}], proj#0..2=[{exprs}])
  EnumerableHashJoin(condition=[=([=12=], )], joinType=[inner])
    JdbcToEnumerableConverter
      JdbcTableScan(table=[[perm, user_table]])
    JdbcToEnumerableConverter
      JdbcProject(id=[[=12=]])
        JdbcTableScan(table=[[insight_user, user_tab]])

Answer 1

可以通过设置 calcite.debug=true 系统属性查看生成的 SQL 查询。发生这种情况的确切位置在 JdbcToEnumerableConverter。由于这是在执行查询期间发生的，因此您必须删除 "explain plan for" 来自 stmt.executeQuery.

请注意，通过将调试模式设置为 true，您将收到许多其他消息以及有关生成代码的其他信息。

Answer 2

有一个 Calcite Hook，Hook.QUERY_PLAN 由 JDBC 查询字符串触发。来自 source:

/** Called with a query that has been generated to send to a back-end system.
* The query might be a SQL string (for the JDBC adapter), a list of Mongo
* pipeline expressions (for the MongoDB adapter), et cetera. */
QUERY_PLAN;

您可以注册一个侦听器来记录任何查询字符串，例如 Java:

Hook.QUERY_PLAN.add((Consumer<String>) s -> LOG.info("Query sent over JDBC:\n" + s));

有没有办法查看Calcite JDBC执行的物理SQL？

Is there any way to view the physical SQLs executed by Calcite JDBC?

jdbc

apache-calcite