Dynamic Schema is an advanced feature in Talend subscription products. It allows you to design Jobs without having to know the structure (names, types, and number of columns) of the data to be handled. You can find more information about this feature at How to process changing data structure?
However, not every component supports the dynamic schema feature. You will get an error as shown below if you select the Dynamic type for a column in the schema of a component that does not support this feature.
You can find a list of components that support the Dynamic type by following these steps:
Go to the Talend Studio installation dir/plugins/ directory and find the jar file org.talend.core.tis_x.x.x.rxxxxxx.jar (for example: org.talend.core.tis_5.6.1.20141207_1530.jar).
Extract the the resources folder from the jar file,
Open the text file supportDynamic.txt in the folder. You will see a list of components that support the Dynamic type, such as: