1476 - Query plan capture, initial wip capturing bind params (#1477)

* 1476 - Query plan capture, initial wip capturing bind params

* No effective change - Reset test default db to H2

* #1476 - Query plan capture, initial wip capturing bind params #1477

Update with consumer

* #1476 - Query plan capture, initial wip capturing bind params #1477

Update with query plan request

* #1476 - Query plan capture, initial wip capturing bind params #1477

Extract interface

* #1476 - Query plan capture, initial wip capturing bind params #1477

Extract interface

src/main/java/io/ebeaninternal/server/query/QueryPlanLoggerPostgres.java

@@ -0,0 +1,31 @@
+package io.ebeaninternal.server.query;
+
+import io.ebeaninternal.server.type.bindcapture.BindCapture;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+/**
+ * A QueryPlanlogger that prefixes "EXPLAIN " to the query. This works for Postgres, H2 and MySql.
+ */
+public class QueryPlanLoggerPostgres extends QueryPlanLogger {
+
+  @Override
+  public DQueryPlanOutput logQueryPlan(Connection conn, CQueryPlan plan, BindCapture bind) {
+
+    String explain = "EXPLAIN " + plan.getSql();
+    try (PreparedStatement explainStmt = conn.prepareStatement(explain)) {
+      bind.prepare(explainStmt, conn);
+      try (ResultSet rset = explainStmt.executeQuery()) {
+        return readQueryPlanBasic(plan, bind, rset);
+      }
+
+    } catch (SQLException e) {
+      queryPlanLog.error("Could not log query plan: " + explain, e);
+      throw new IllegalStateException("Failed to obtain explain plan: " + explain, e);
+    }
+  }
+
+}