From 97dca1dc6177d39fef054213750f05d46be1433d Mon Sep 17 00:00:00 2001
From: Jiachen1018 <lijiachen15@huawei.com>
Date: Mon, 15 Apr 2024 15:36:33 +0800
Subject: [PATCH] fix no stats

---
 storage/tianchi/ha_tse.cc  | 2 +-
 storage/tianchi/tse_cbo.cc | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/storage/tianchi/ha_tse.cc b/storage/tianchi/ha_tse.cc
index 6819c62..07e70b2 100644
--- a/storage/tianchi/ha_tse.cc
+++ b/storage/tianchi/ha_tse.cc
@@ -3911,7 +3911,7 @@ ha_rows ha_tse::records_in_range(uint inx, key_range *min_key,
   if (m_share) {
     if (!m_share->cbo_stats->is_updated) {
         tse_log_debug("table %s has not been analyzed", table->alias);
-        density = DEFAULT_RANGE_DENSITY;
+        return 1;
     }
     density = calc_density_one_table(inx, &key, m_share->cbo_stats->tse_cbo_stats_table, *table);
     /*
diff --git a/storage/tianchi/tse_cbo.cc b/storage/tianchi/tse_cbo.cc
index f1d1239..ac2852a 100644
--- a/storage/tianchi/tse_cbo.cc
+++ b/storage/tianchi/tse_cbo.cc
@@ -403,6 +403,9 @@ double calc_density_by_cond(tse_cbo_stats_table_t cbo_stats, KEY_PART_INFO cur_i
 double calc_density_one_table(uint16_t idx_id, tse_range_key *key,
                               tse_cbo_stats_table_t cbo_stats, const TABLE &table)
 {
+  if (cbo_stats.estimate_rows == 0) { // no stats or empty table
+    return 0;
+  }
   double density = 1.0;
   uint32 col_id;
   uint32_t key_offset = 0;//列在索引中的偏移量
-- 
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