Core/DBLayer: Optimize string based query results by eliminating unneeded buffer copies

(cherry picked from commit 59f1f60a8387479d93dc64e3ecc3a56b7f0cbf34)

# Conflicts:
#	src/server/database/Database/Field.cpp
#	src/server/database/Database/Field.h
#	src/server/database/Database/QueryResult.cpp

1 files changed, 39 insertions, 90 deletions

diff --git a/src/server/database/Database/Field.cpp b/src/server/database/Database/Field.cpp
index ef257792eff..c0a4d329cd4 100644
--- a/src/server/database/Database/Field.cpp
+++ b/src/server/database/Database/Field.cpp
@@ -17,19 +17,17 @@
 
 #include "Field.h"
 #include "Log.h"
+#include "MySQLHacks.h"
 
 Field::Field()
 {
     data.value = nullptr;
-    data.type = DatabaseFieldTypes::Null;
     data.length = 0;
     data.raw = false;
+    meta = nullptr;
 }
 
-Field::~Field()
-{
-    CleanUp();
-}
+Field::~Field() = default;
 
 uint8 Field::GetUInt8() const
 {
@@ -46,8 +44,8 @@ uint8 Field::GetUInt8() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<uint8*>(data.value);
-    return static_cast<uint8>(strtoul((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<uint8 const*>(data.value);
+    return static_cast<uint8>(strtoul(data.value, nullptr, 10));
 }
 
 int8 Field::GetInt8() const
@@ -65,8 +63,8 @@ int8 Field::GetInt8() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<int8*>(data.value);
-    return static_cast<int8>(strtol((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<int8 const*>(data.value);
+    return static_cast<int8>(strtol(data.value, nullptr, 10));
 }
 
 uint16 Field::GetUInt16() const
@@ -84,8 +82,8 @@ uint16 Field::GetUInt16() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<uint16*>(data.value);
-    return static_cast<uint16>(strtoul((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<uint16 const*>(data.value);
+    return static_cast<uint16>(strtoul(data.value, nullptr, 10));
 }
 
 int16 Field::GetInt16() const
@@ -103,8 +101,8 @@ int16 Field::GetInt16() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<int16*>(data.value);
-    return static_cast<int16>(strtol((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<int16 const*>(data.value);
+    return static_cast<int16>(strtol(data.value, nullptr, 10));
 }
 
 uint32 Field::GetUInt32() const
@@ -122,8 +120,8 @@ uint32 Field::GetUInt32() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<uint32*>(data.value);
-    return static_cast<uint32>(strtoul((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<uint32 const*>(data.value);
+    return static_cast<uint32>(strtoul(data.value, nullptr, 10));
 }
 
 int32 Field::GetInt32() const
@@ -141,8 +139,8 @@ int32 Field::GetInt32() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<int32*>(data.value);
-    return static_cast<int32>(strtol((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<int32 const*>(data.value);
+    return static_cast<int32>(strtol(data.value, nullptr, 10));
 }
 
 uint64 Field::GetUInt64() const
@@ -160,8 +158,8 @@ uint64 Field::GetUInt64() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<uint64*>(data.value);
-    return static_cast<uint64>(strtoull((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<uint64 const*>(data.value);
+    return static_cast<uint64>(strtoull(data.value, nullptr, 10));
 }
 
 int64 Field::GetInt64() const
@@ -179,8 +177,8 @@ int64 Field::GetInt64() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<int64*>(data.value);
-    return static_cast<int64>(strtoll((char*)data.value, nullptr, 10));
+        return *reinterpret_cast<int64 const*>(data.value);
+    return static_cast<int64>(strtoll(data.value, nullptr, 10));
 }
 
 float Field::GetFloat() const
@@ -198,8 +196,8 @@ float Field::GetFloat() const
 #endif
 
     if (data.raw)
-        return *reinterpret_cast<float*>(data.value);
-    return static_cast<float>(atof((char*)data.value));
+        return *reinterpret_cast<float const*>(data.value);
+    return static_cast<float>(atof(data.value));
 }
 
 double Field::GetDouble() const
@@ -217,8 +215,8 @@ double Field::GetDouble() const
 #endif
 
     if (data.raw && !IsType(DatabaseFieldTypes::Decimal))
-        return *reinterpret_cast<double*>(data.value);
-    return static_cast<double>(atof((char*)data.value));
+        return *reinterpret_cast<double const*>(data.value);
+    return static_cast<double>(atof(data.value));
 }
 
 char const* Field::GetCString() const
@@ -260,93 +258,44 @@ std::vector<uint8> Field::GetBinary() const
     return result;
 }
 
-void Field::SetByteValue(void* newValue, DatabaseFieldTypes newType, uint32 length)
+void Field::SetByteValue(char const* newValue, uint32 length)
 {
     // This value stores raw bytes that have to be explicitly cast later
     data.value = newValue;
     data.length = length;
-    data.type = newType;
     data.raw = true;
 }
 
-void Field::SetStructuredValue(char* newValue, DatabaseFieldTypes newType, uint32 length)
+void Field::SetStructuredValue(char const* newValue, uint32 length)
 {
-    if (data.value)
-        CleanUp();
-
     // This value stores somewhat structured data that needs function style casting
-    if (newValue)
-    {
-        data.value = new char[length + 1];
-        memcpy(data.value, newValue, length);
-        *(reinterpret_cast<char*>(data.value) + length) = '\0';
-        data.length = length;
-    }
-
-    data.type = newType;
+    data.value = newValue;
+    data.length = length;
     data.raw = false;
 }
 
 bool Field::IsType(DatabaseFieldTypes type) const
 {
-    return data.type == type;
+    return meta->Type == type;
 }
 
 bool Field::IsNumeric() const
 {
-    return (data.type == DatabaseFieldTypes::Int8 ||
-        data.type == DatabaseFieldTypes::Int16 ||
-        data.type == DatabaseFieldTypes::Int32 ||
-        data.type == DatabaseFieldTypes::Int64 ||
-        data.type == DatabaseFieldTypes::Float ||
-        data.type == DatabaseFieldTypes::Double);
+    return (meta->Type == DatabaseFieldTypes::Int8 ||
+        meta->Type == DatabaseFieldTypes::Int16 ||
+        meta->Type == DatabaseFieldTypes::Int32 ||
+        meta->Type == DatabaseFieldTypes::Int64 ||
+        meta->Type == DatabaseFieldTypes::Float ||
+        meta->Type == DatabaseFieldTypes::Double);
 }
 
-#ifdef TRINITY_STRICT_DATABASE_TYPE_CHECKS
-
-#include "MySQLHacks.h"
-
-static char const* FieldTypeToString(enum_field_types type)
+void Field::LogWrongType(char const* getter) const
 {
-    switch (type)
-    {
-        case MYSQL_TYPE_BIT:         return "BIT";
-        case MYSQL_TYPE_BLOB:        return "BLOB";
-        case MYSQL_TYPE_DATE:        return "DATE";
-        case MYSQL_TYPE_DATETIME:    return "DATETIME";
-        case MYSQL_TYPE_NEWDECIMAL:  return "NEWDECIMAL";
-        case MYSQL_TYPE_DECIMAL:     return "DECIMAL";
-        case MYSQL_TYPE_DOUBLE:      return "DOUBLE";
-        case MYSQL_TYPE_ENUM:        return "ENUM";
-        case MYSQL_TYPE_FLOAT:       return "FLOAT";
-        case MYSQL_TYPE_GEOMETRY:    return "GEOMETRY";
-        case MYSQL_TYPE_INT24:       return "INT24";
-        case MYSQL_TYPE_LONG:        return "LONG";
-        case MYSQL_TYPE_LONGLONG:    return "LONGLONG";
-        case MYSQL_TYPE_LONG_BLOB:   return "LONG_BLOB";
-        case MYSQL_TYPE_MEDIUM_BLOB: return "MEDIUM_BLOB";
-        case MYSQL_TYPE_NEWDATE:     return "NEWDATE";
-        case MYSQL_TYPE_NULL:        return "NULL";
-        case MYSQL_TYPE_SET:         return "SET";
-        case MYSQL_TYPE_SHORT:       return "SHORT";
-        case MYSQL_TYPE_STRING:      return "STRING";
-        case MYSQL_TYPE_TIME:        return "TIME";
-        case MYSQL_TYPE_TIMESTAMP:   return "TIMESTAMP";
-        case MYSQL_TYPE_TINY:        return "TINY";
-        case MYSQL_TYPE_TINY_BLOB:   return "TINY_BLOB";
-        case MYSQL_TYPE_VAR_STRING:  return "VAR_STRING";
-        case MYSQL_TYPE_YEAR:        return "YEAR";
-        default:                     return "-Unknown-";
-    }
+    TC_LOG_WARN("sql.sql", "Warning: %s on %s field %s.%s (%s.%s) at index %u.",
+        getter, meta->TypeName, meta->TableAlias, meta->Alias, meta->TableName, meta->Name, meta->Index);
 }
 
-void Field::SetMetadata(MySQLField* field, uint32 fieldIndex)
+void Field::SetMetadata(QueryResultFieldMetadata const* fieldMeta)
 {
-    meta.TableName = field->org_table;
-    meta.TableAlias = field->table;
-    meta.Name = field->org_name;
-    meta.Alias = field->name;
-    meta.Type = FieldTypeToString(field->type);
-    meta.Index = fieldIndex;
+    meta = fieldMeta;
 }
-#endif