diff options
| -rw-r--r-- | src/tools/backend/index.html | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/tools/backend/index.html b/src/tools/backend/index.html index 6aff709af6d..2fb2a096af2 100644 --- a/src/tools/backend/index.html +++ b/src/tools/backend/index.html @@ -43,8 +43,10 @@ Certain queries, like <I>SELECT,</I> return columns of data. Other queries, like <I>INSERT</I> and <I>UPDATE,</I> specify the columns modified by the query. These column references are converted to <A HREF="../../include/nodes/primnodes.h">Resdom</A> entries, which are -linked together to make up the <I>target list</I> of the query. The -target list is stored in Query.targetList, which is generated by +placed in <A HREF="../../include/nodes/parsenodes.h">target list +entries,</I> and linked together to make up the <I>target list</I> of +the query. The target list is stored in Query.targetList, which is +generated by <A HREF="../../backend/parser/parse_target.c">transformTargetList().</A> <P> Other query elements, like aggregates(<I>SUM()</I>), <I>GROUP BY,</I> @@ -62,9 +64,13 @@ HREF="../../backend/optimizer/path">path</A> module determines the best table join order and join type of each table in the RangeTable, using Query.qual(<I>WHERE</I> clause) to consider optimal index usage. <P> + The Plan is then passed to the <A HREF="../../backend/executor">executor</A> for execution, and the result -returned to the client. +returned to the client. The Plan actually as set of nodes, arranged in +a tree structure with a top-level node, and various sub-nodes as +children. + <P> There are many other modules that support this basic functionality. They can be accessed by clicking on the flowchart. |