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Update execTuples.cpp

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ljh0804 2023-09-06 20:27:48 +08:00
parent c986f2fecc
commit bd5ccf49db
1 changed files with 23 additions and 26 deletions
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src/gausskernel/runtime/executor/execTuples.cpp
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@ -1,20 +1,17 @@
/* -------------------------------------------------------------------------
*
* execTuples.cpp
* Routines dealing with TupleTableSlots. These are used for resource
* management associated with tuples (eg, releasing buffer pins for
* tuples in disk buffers, or freeing the memory occupied by transient
* tuples). Slots also provide access abstraction that lets us implement
* "virtual" tuples to reduce data-copying overhead.
* 处理TupleTableSlots的例程。这些用于与元组相关的资源管理
*（例如，释放磁盘缓冲区中元组的缓冲引脚，或释放传输元组占用的内存）。
* 插槽还提供访问抽象，使我们能够实现“虚拟”元组，以减少数据复制开销。
*
* Routines dealing with the type information for tuples. Currently,
* the type information for a tuple is an array of FormData_pg_attribute.
* This information is needed by routines manipulating tuples
* (getattribute, formtuple, etc.).
* 处理元组的类型信息的例程。
* 目前，元组的类型信息是FormData_pg_attribute的数组。
* 处理元组（getattribute、formtuple等）的例程需要这些信息。
*
* Portions Copyright (c) 2020 Huawei Technologies Co.,Ltd.
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
* 部分版权所有（c）2020华为技术有限公司有限公司。
* 部分版权所有（c）1996-2012，PostgreSQL全球发展集团
* 部分版权所有（c）1994，加州大学董事会
*
*
* IDENTIFICATION
@ -24,22 +21,22 @@
* INTERFACE ROUTINES
*
* SLOT CREATION/DESTRUCTION
* MakeTupleTableSlot - create an empty slot
* ExecAllocTableSlot - create a slot within a tuple table
* ExecResetTupleTable - clear and optionally delete a tuple table
* MakeSingleTupleTableSlot - make a standalone slot, set its descriptor
* ExecDropSingleTupleTableSlot - destroy a standalone slot
* MakeTupleTableSlot - 创建一个空插槽
* ExecAllocTableSlot - 在元组表中创建槽
* ExecResetTupleTable - 清除并可选择删除元组表
* MakeSingleTupleTableSlot - 制作一个独立插槽，设置其描述符
* ExecDropSingleTupleTableSlot - 销毁独立插槽
*
* SLOT ACCESSORS
* ExecSetSlotDescriptor - set a slot's tuple descriptor
* ExecStoreTuple - store a physical tuple in the slot
* ExecStoreMinimalTuple - store a minimal physical tuple in the slot
* ExecClearTuple - clear contents of a slot
* ExecStoreVirtualTuple - mark slot as containing a virtual tuple
* ExecCopySlotTuple - build a physical tuple from a slot
* ExecCopySlotMinimalTuple - build a minimal physical tuple from a slot
* ExecMaterializeSlot - convert virtual to physical storage
* ExecCopySlot - copy one slot's contents to another
* ExecSetSlotDescriptor - 设置槽的元组描述符
* ExecStoreTuple - 在插槽中存储物理元组
* ExecStoreMinimalTuple - 在插槽中存储最小物理元组
* ExecClearTuple - 清除槽中的内容
* ExecStoreVirtualTuple - 将slot标记为包含虚拟元组
* ExecCopySlotTuple - 从插槽构建物理元组
* ExecCopySlotMinimalTuple - 从插槽构建最小物理元组
* ExecMaterializeSlot - 将虚拟存储转换为物理存储
* ExecCopySlot - 将一个插槽的内容复制到另一个插槽
*
* CONVENIENCE INITIALIZATION ROUTINES
* ExecInitResultTupleSlot \ convenience routines to initialize