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new 77965c9 Update node.md
77965c9 is described below
commit 77965c9139722aef01a4f74cd8d17c14a8ec6674
Author: Josh Innis <[email protected]>
AuthorDate: Fri Oct 14 16:02:38 2022 +0900
Update node.md
---
docs/postgres/node.md | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/docs/postgres/node.md b/docs/postgres/node.md
index 9ae5e74..47ce7d9 100644
--- a/docs/postgres/node.md
+++ b/docs/postgres/node.md
@@ -2,7 +2,7 @@
## Overview
-Postgres has a default struct that it uses for throughout most of its query
processing engine, <a
src='https://github.com/postgres/postgres/blob/master/src/include/nodes/nodes.h#L105'>Node</a>.
The Node struct is defined as follows:
+Postgres has a default struct that it uses for throughout most of its query
processing engine, <a
href='https://github.com/postgres/postgres/blob/master/src/include/nodes/nodes.h#L105'>Node</a>.
The Node struct is defined as follows:
```
typedef struct Node
@@ -19,7 +19,7 @@ The stuct Node and Postgres as a whole take advantage of
pointers and how C allo
Unlike a variable a pointer stores the memory address of a variable. In other
words, it tells you where in memory something is located. Its a pretty simple
concept, that holds a lot of complexity and power within it.
-For a full tutorial of pointers you can <a src
='https://www.youtube.com/watch?v=zuegQmMdy8M&ab_channel=freeCodeCamp.org'>watch
this tutorial.</a>
+For a full tutorial of pointers you can <a
href='https://www.youtube.com/watch?v=zuegQmMdy8M&ab_channel=freeCodeCamp.org'>watch
this tutorial.</a>
For our purposes, the important thing to note about pointers is. All pointers
are the same: a 4 byte integer.
@@ -51,7 +51,7 @@ typedef struct myStruct
When we allocate room for that struct, a set amount of bytes for the struct
will be found in memory and allocated. In our above example, on most modern
systems: 4 bytes for var1, 4 bytes for var2 and 1 byte for var3 resulting in 9
bytes total being allocated for the struct, and they will be allocated in the
order that they are defined above.
-for a further tutorial of structs please review this <a
src='https://www.simplilearn.com/tutorials/c-tutorial/structure-in-c'>tutorial.</a>
+for a further tutorial of structs please review this <a
href='https://www.simplilearn.com/tutorials/c-tutorial/structure-in-c'>tutorial.</a>
## Pointers to Structs
@@ -93,7 +93,7 @@ Postgres has designed a way to use the power of void
pointers, but with certain
## How Postgres Uses Structs and Pointers
-Void pointers assume nothing about what the pointer is referencing. The Node
struct on the other hand know about one field the <a
src='https://github.com/postgres/postgres/blob/REL_11_17/src/include/nodes/nodes.h#L26'>enum
NodeType</a>. Nearly all the postgres data structures used in the query
processing engine start with this field.
+Void pointers assume nothing about what the pointer is referencing. The Node
struct on the other hand know about one field the <a
href='https://github.com/postgres/postgres/blob/REL_11_17/src/include/nodes/nodes.h#L26'>enum
NodeType</a>. Nearly all the postgres data structures used in the query
processing engine start with this field.
For example, here is the data structure that represents a fucntion call in the
parser phase:
@@ -161,6 +161,6 @@ The at points where the differences do matter, the NodeTag
can be checked and th
## Extensible Nodes
-Postgres offers a unique node in its system, <a
src='https://github.com/postgres/postgres/blob/master/src/include/nodes/extensible.h#L32'>ExtensibleNode</a>.
With this node we can add extra nodes to Postgres via extensions that age can
pass around in the Postgres system.
+Postgres offers a unique node in its system, <a
href='https://github.com/postgres/postgres/blob/master/src/include/nodes/extensible.h#L32'>ExtensibleNode</a>.
With this node we can add extra nodes to Postgres via extensions that age can
pass around in the Postgres system.
-AGE's custom nodes that utilize this feature can be found <a
src='https://github.com/apache/age/blob/master/src/include/nodes/cypher_nodes.h'>here</a>.
+AGE's custom nodes that utilize this feature can be found <a
href='https://github.com/apache/age/blob/master/src/include/nodes/cypher_nodes.h'>here</a>.
