Undo and Redo

1. Overview

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1.1. Function Description

"Undo and Redo" provide more flexible operation and error correction capabilities during ETL editing. With these two buttons, users can easily revert to previous states, correct misoperations, or try different editing schemes again. The undo function makes error correction simple, while the redo function allows users to reapply previous operations, ensuring editing continuity. This improves the fault tolerance of ETL developers when designing and optimizing data processing flows, reducing errors and repetitive work caused by misoperations.

1.2. Usage Restrictions

• Must be used while editing the current page; after refreshing or exiting the editing page, undo and redo operations cannot be used.
• Undo and redo operations only record the last 30 steps each.

2. Usage Instructions

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Click Undo to return to the node state before the latest operation, shortcut key "command/ctrl"+"z";

Click Redo to return to the node state before the undo operation, shortcut key "command/ctrl"+"shift"+"z".

After an ETL change, the corresponding change operation will be cached. "Undo" and "Redo" support up to 30 steps each; each time you undo or redo, one operation is cached. The cache is cleared after refreshing the page or exiting the editing page.

Operation cache: The cache is cleared after refreshing the page or exiting the editing page.

Dimension	Operation Object	Caching Timing
Canvas Level	Node/Connection/Annotation	Node copy, delete, name modification
		Connection, auto layout, node movement
		Annotation add, edit, delete
Node Level	Input Dataset	Entire node level, dataset selection confirmation does not need caching, dataset replacement
	Output Dataset	Dataset name edit, save directory modification, acceleration field setting, annotation edit
	Add Calculated Column	Calculated field add/edit/delete
	Merge Columns	New column name edit, merge column add/delete, delete original column selection, separator setting
	Group Aggregation	Calculated field add/edit/delete, dimension and value modification/alias/aggregation method
	Select Columns	Column select/deselect, rename, order adjustment
	Row to Column	Operation column selection, fill column selection, aggregation type selection, primary key column selection, new column add/delete, new column name same as original row value check
	Column to Row	Label column name edit, value column name edit, new column add/delete, new row name same as original column value check
	Filter Data Rows	Filter rule add/delete/copy/edit, trigger condition setting
	Remove Duplicates	Deduplication column add/delete
	Replace Values	Replace column selection, replacement result write method modification, value not meeting replacement rule setting, replacement rule edit/delete
	Replace Null Values	Replacement rule add, replacement value modification, replacement rule delete
	Row Concatenation	Row concatenation rule selection
	Data Join	Join column add/delete, pre/post join field selection, join type setting
	SQL Input	Existing dataset order adjustment, each query SQL edit
	Other Nodes	Cached at node level, internal