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put back index.md in docs folder
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brunomurino committed Jun 24, 2023
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18 changes: 10 additions & 8 deletions README.md
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## Context

Assume you have 2 services:

* Service 1 is responsible for creating a table A
* Service 2 requires using data from that same table A

You can modify Service 1 to change the format/schema/content of table A, like:
* Remove/Add a column
* Change the data type of a columns
* Change from Integer to String
* Change the semantic meaning of a column
* Change the constraints on the values of a column
* Column uniqueness
* Column cannot be empty
* Column allowed values

* Remove/Add a column
* Change the data type of a columns
* Change from Integer to String
* Change the semantic meaning of a column
* Change the constraints on the values of a column
* Column uniqueness
* Column cannot be empty
* Column allowed values

On the other hand, the "requirements" from Service 2 can be more or less strict
* It only needs a subset of columns from table A
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# Arrow Data Contract

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