From f4f79aa84a73397ef93331fc9432527fb367899f Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <a3at.mail@gmail.com>
Date: Sat, 3 Oct 2020 22:55:02 +0300
Subject: [PATCH] Add HashTable::reserve() (for preallocated
 hashed/sparse_hashed dictionaries)

---
 src/Common/HashTable/HashTable.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Common/HashTable/HashTable.h b/src/Common/HashTable/HashTable.h
index baad5d40764..897c84fe951 100644
--- a/src/Common/HashTable/HashTable.h
+++ b/src/Common/HashTable/HashTable.h
@@ -850,6 +850,11 @@ protected:
 
 
 public:
+    void reserve(size_t num_elements)
+    {
+        resize(num_elements);
+    }
+
     /// Insert a value. In the case of any more complex values, it is better to use the `emplace` function.
     std::pair<LookupResult, bool> ALWAYS_INLINE insert(const value_type & x)
     {