/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#define USING_LOG_PREFIX SQL_ENG

#include "ob_hash_partitioning_infrastructure_op.h"

using namespace oceanbase::common;
using namespace oceanbase::sql;

int ObHashPartCols::equal(
  const ObHashPartCols &other,
  const ObIArray<ObSortFieldCollation> *sort_collations,
  const ObIArray<ObCmpFunc> *cmp_funcs,
  bool &result) const
{
  int ret = OB_SUCCESS;
  result = true;
  if (OB_ISNULL(sort_collations) || OB_ISNULL(cmp_funcs)) {
    result = false;
  } else if (use_expr_ || other.use_expr_) {
    result = false;
  } else {
    int cmp_result = 0;
    ObDatum *l_cells = store_row_->cells();
    ObDatum *r_cells = other.store_row_->cells();
    for (int64_t i = 0; OB_SUCC(ret) && i < sort_collations->count() && 0 == cmp_result; ++i) {
      int64_t idx = sort_collations->at(i).field_idx_;
      if (OB_FAIL(cmp_funcs->at(i).cmp_func_(l_cells[idx], r_cells[idx], cmp_result))) {
        LOG_WARN("do cmp failed", K(ret));
      }
    }
    result = (0 == cmp_result);
  }
  return ret;
}

int ObHashPartCols::equal_distinct(
  const common::ObIArray<ObExpr*> *exprs,
  const ObHashPartCols &other,
  const ObIArray<ObSortFieldCollation> *sort_collations,
  const ObIArray<ObCmpFunc> *cmp_funcs,
  ObEvalCtx *eval_ctx,
  bool &result, ObEvalCtx::BatchInfoScopeGuard &batch_info_guard) const
{
  UNUSED(other);
  int ret = OB_SUCCESS;
  result = true;
  int cmp_result = 0;
  if (OB_ISNULL(sort_collations) || OB_ISNULL(cmp_funcs)
      || OB_ISNULL(eval_ctx) || OB_ISNULL(exprs)) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("unexpected status: compare info is null",
      K(sort_collations), K(cmp_funcs), K(eval_ctx), K(exprs), K(ret));
  } else if (use_expr_) {
    //for this situation, must be crash in a batch, need to get datum from expr
    ObDatum *l_cell = nullptr;
    ObDatum *r_cell = nullptr;
    const int64_t right_batch_idx = eval_ctx->get_batch_idx();
    const int64_t left_batch_idx = batch_idx_;
    for (int64_t i = 0; OB_SUCC(ret) && i < sort_collations->count() && 0 == cmp_result; ++i) {
      int64_t idx = sort_collations->at(i).field_idx_;
      batch_info_guard.set_batch_idx(left_batch_idx);
      //be careful left && right exprs are evaled in calc_hash_values
      l_cell = &exprs->at(idx)->locate_expr_datum(*eval_ctx);
      batch_info_guard.set_batch_idx(right_batch_idx);
      r_cell = &exprs->at(idx)->locate_expr_datum(*eval_ctx);
      if (OB_FAIL(cmp_funcs->at(i).cmp_func_(*l_cell, *r_cell, cmp_result))) {
        LOG_WARN("do cmp failed", K(ret));
      }
    }
    //reset batch_idx before return 
    batch_info_guard.set_batch_idx(right_batch_idx);
    result = (0 == cmp_result);
  } else {
    ObDatum *l_cells = store_row_->cells();
    ObDatum *r_cell = nullptr;
    // must evaled in calc_hash_values
    for (int64_t i = 0; OB_SUCC(ret) && i < sort_collations->count() && 0 == cmp_result; ++i) {
      int64_t idx = sort_collations->at(i).field_idx_;
      r_cell = &exprs->at(idx)->locate_expr_datum(*eval_ctx);
      if (OB_FAIL(cmp_funcs->at(i).cmp_func_(l_cells[idx], *r_cell, cmp_result))) {
        LOG_WARN("do cmp failed", K(ret));
      }
    }
    result = (0 == cmp_result);
  }
  return ret;
}