Esempio n. 1
0
 /** Returns the expression to access a table within a schema. */
 public static Expression tableExpression(
     Schema schema, Type elementType, String tableName, Class clazz) {
   final MethodCallExpression expression;
   if (Table.class.isAssignableFrom(clazz)) {
     expression =
         Expressions.call(
             schema.getExpression(),
             BuiltinMethod.SCHEMA_GET_TABLE.method,
             Expressions.constant(tableName));
   } else {
     expression =
         Expressions.call(
             BuiltinMethod.SCHEMAS_QUERYABLE.method,
             DataContext.ROOT,
             schema.getExpression(),
             Expressions.constant(elementType),
             Expressions.constant(tableName));
   }
   return Types.castIfNecessary(clazz, expression);
 }
Esempio n. 2
0
 /** Returns the expression for a sub-schema. */
 public static Expression subSchemaExpression(Schema schema, String name, Class type) {
   // (Type) schemaExpression.getSubSchema("name")
   Expression call =
       Expressions.call(
           schema.getExpression(),
           BuiltinMethod.SCHEMA_GET_SUB_SCHEMA.method,
           Expressions.constant(name));
   // CHECKSTYLE: IGNORE 2
   //noinspection unchecked
   if (false && type != null && !type.isAssignableFrom(Schema.class)) {
     return unwrap(call, type);
   }
   return call;
 }
Esempio n. 3
0
    @Override
    protected PreparedExecution implement(
        RelDataType rowType,
        RelNode rootRel,
        SqlKind sqlKind,
        ClassDeclaration decl,
        Argument[] args) {
      RelDataType resultType = rootRel.getRowType();
      boolean isDml = sqlKind.belongsTo(SqlKind.DML);
      javaCompiler = createCompiler();
      EnumerableRelImplementor relImplementor =
          getRelImplementor(rootRel.getCluster().getRexBuilder());
      BlockExpression expr = relImplementor.implementRoot((EnumerableRel) rootRel);
      ParameterExpression root0 = Expressions.parameter(DataContext.class, "root0");
      String s =
          Expressions.toString(
              Blocks.create(
                  Expressions.declare(
                      Modifier.FINAL, (ParameterExpression) schema.getExpression(), root0),
                  expr),
              false);

      final Executable executable;
      try {
        executable =
            (Executable)
                ExpressionEvaluator.createFastScriptEvaluator(
                    s, Executable.class, new String[] {root0.name});
      } catch (Exception e) {
        throw Helper.INSTANCE.wrap("Error while compiling generated Java code:\n" + s, e);
      }

      if (timingTracer != null) {
        timingTracer.traceTime("end codegen");
      }

      if (timingTracer != null) {
        timingTracer.traceTime("end compilation");
      }

      return new PreparedExecution(
          null, rootRel, resultType, isDml, mapTableModOp(isDml, sqlKind), null) {
        public Object execute() {
          return executable.execute(schema);
        }
      };
    }