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To query large outputs or large number of fragments across all anchors, we need to provide pagination for Query API( query data nodes across all anchors). it will help client to fetch limited set of data per request. below is two possible solutions for further discussions to decide appropriate choice.
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| Query | Description | Decision |
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| SELECT id, anchor_id AS anchorId, xpath, parent_id AS parentId, CAST(attributes AS TEXT) AS attributes FROM FRAGMENT WHERE xpath ~ :xpathRegex ORDERED BY id LIMIT :pageSize OFFSET OFFSET (:pageIndex + - 1) * :pageSize | Query limited fragments in order of fragment id |
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| Parameter | isRequired | Description |
|---|
| cps-path | yes | node path to be queried |
| descendants | no | Number of descendants to be queried. default is none |
| pageIndex | no | page index starting from 1. |
| anchorSize | no | number of anchors per page starting from 1 (TBD). |
Query:
| Query | Description | Decision |
|---|
| SELECT |
anchor_ ordered anchor_| id LIMIT : anchorSize OFFSET : (pageIndex |
+| -1) * :anchorSize | query number of anchors to query from fragment table |
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| SELECT id, anchor_id AS anchorId, xpath, parent_id AS parentId, CAST(attributes AS TEXT) AS attributes FROM FRAGMENT WHERE anchor_id IN :anchorList AND xpath ~ :xpathRegex | query fragments for list of anchors from above query |
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