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delta-sharing-protocl-api-description.yml
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delta-sharing-protocl-api-description.yml
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---
openapi: "3.0.2"
info:
description: |
The Delta Sharing protocol is still very early in its development.
version: "0.2"
title: Delta Sharing Protocol
contact:
email: ""
license:
name: "AGPL v3.0"
url: "https://www.gnu.org/licenses/agpl-3.0.en.html"
servers:
- url: 'http://localhost:8000/api/v1'
description: Local dev server (APIv1)
- url: 'https://sharing.delta.io/delta-sharing/'
description: 'Demo Delta Sharing server'
tags:
- name: 'shares'
description: Share discovery APIs
- name: 'schemas'
description: Schema discovery APIs
- name: 'tables'
description: Table query and inspection APIs
- name: 'official'
description: APIs which are part of published official document
- name: 'proposed'
description: APIs which are part proposed and may or may not be part of official
paths:
'/shares':
get:
operationId: 'ListShares'
summary: 'List the shares accessible to the recipient'
description: |
Without any query parameters the request will return the first page
of "shares" available to the authenticated recipient
tags:
- shares
- official
parameters: &pagination
- in: query
name: maxResults
required: false
description: |
The maximum number of results to be returned in a single page. If
the number of potential results exceeds the number of maximum
results, the response will contain a `nextpageToken` which can be
used in subsequent requests.
example: '30'
schema:
type: number
format: int32
default: 500
- in: query
name: pageToken
required: false
description: Optionally provided page token for requesting a subsequent page of results
schema:
type: string
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: |
The user could successfully list the shares
content:
application/json:
schema:
$ref: '#/components/schemas/ListShareResponse'
'/shares/{share}':
get:
operationId: 'GetShare'
summary: 'get the metadata of a share'
tags:
- shares
- official
parameters:
- in: path
name: share
required: true
description: 'Named share'
schema:
type: string
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: 'The share''s metadata was successfully returned'
content:
application/json:
schema:
"$ref": "#/components/schemas/Share"
'/shares/{share}/schemas':
get:
operationId: 'ListSchemas'
summary: 'List the schemas in a share'
tags:
- shares
- official
parameters:
- in: path
name: share
required: true
description: 'Named share to list the schemas'
schema:
type: string
- in: query
name: maxResults
required: false
description: |
The maximum number of results to be returned in a single page. If
the number of potential results exceeds the number of maximum
results, the response will contain a `nextpageToken` which can be
used in subsequent requests.
example: '30'
schema:
type: number
format: int32
default: 500
- in: query
name: pageToken
required: false
description: Optionally provided page token for requesting a subsequent page of results
schema:
type: string
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: |
The user could successfully list the schemas in the given share
content:
application/json:
schema:
$ref: '#/components/schemas/ListSchemasResponse'
'/shares/{share}/schemas/{schema}/tables':
get:
operationId: 'ListTables'
summary: "List the tables in a given share's schema"
tags:
- schemas
- official
parameters:
- in: path
name: share
required: true
description: 'Named share for finding the named schema'
schema:
type: string
- in: path
name: schema
required: true
description: 'Named schema for listing tables'
schema:
type: string
- in: query
name: maxResults
required: false
description: |
The maximum number of results to be returned in a single page. If
the number of potential results exceeds the number of maximum
results, the response will contain a `nextpageToken` which can be
used in subsequent requests.
example: '30'
schema:
type: number
format: int32
default: 500
- in: query
name: pageToken
required: false
description: Optionally provided page token for requesting a subsequent page of results
schema:
type: string
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: |
The user could successfully list the tables for the given schema in the given share
content:
application/json:
schema:
$ref: '#/components/schemas/ListTablesResponse'
'/shares/{share}/all-tables':
get:
operationId: 'ListALLTables'
summary: "List the tables under all schemas in a share"
tags:
- shares
- official
parameters:
- in: path
name: share
required: true
description: 'Named share for finding the named schema'
schema:
type: string
- in: query
name: maxResults
required: false
description: |
The maximum number of results to be returned in a single page. If
the number of potential results exceeds the number of maximum
results, the response will contain a `nextpageToken` which can be
used in subsequent requests.
example: '30'
schema:
type: number
format: int32
default: 500
- in: query
name: pageToken
required: false
description: Optionally provided page token for requesting a subsequent page of results
schema:
type: string
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: |
The user could successfully list the tables under all schemas in a share
content:
application/json:
schema:
$ref: '#/components/schemas/ListTablesResponse'
'/shares/{share}/schemas/{schema}/tables/{table}/version':
get:
operationId: 'GetTableVersion'
summary: 'Return the table version'
description: |
This is the API for clients to get a table version without any other
extra information. The server usually can implement this API
effectively. If a client caches information about a shared table
locally, it can store the table version and use this cheap API to
quickly check whether their cache is stale and they should re-fetch the
data.
tags:
- tables
- official
parameters: &tableParameters
- in: path
name: share
required: true
description: 'Named share for finding the named schema'
schema:
type: string
- in: path
name: schema
required: true
description: 'Named schema for finding the named table'
schema:
type: string
- in: path
name: table
required: true
description: 'Named table'
schema:
type: string
- in: query
name: startingTimestamp
required: false
description: 'Starting Timestamp'
schema:
type: string
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: 'The table was found and has a version'
headers:
Delta-Table-Version:
description: 'A long value which represents the current table version'
schema:
type: integer
'/shares/{share}/schemas/{schema}/tables/{table}/metadata':
get:
operationId: 'GetTableMetadata'
summary: 'Query the metadata and schema of the given table'
tags:
- tables
- official
parameters: *tableParameters
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: |
A sequence of JSON strings containing the table protocol
and then the table metadata
headers:
Delta-Table-Version:
description: 'A long value which represents the current table version'
schema:
type: integer
content:
'application/x-ndjson':
schema:
$ref: '#/components/schemas/TableMetadataResponse'
'/shares/{share}/schemas/{schema}/tables/{table}/query':
post:
operationId: 'QueryTable'
summary: 'Query the table'
tags:
- tables
- official
parameters: *tableParameters
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/QueryRequest'
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: |
A sequence of JSON strings containing the table protocol, metadata,
and then a number of lines for each file in the table.
headers:
Delta-Table-Version:
description: 'A long value which represents the current table version'
schema:
type: integer
content:
'application/x-ndjson':
schema:
$ref: '#/components/schemas/TableQueryResponse'
'/shares/{share}/schemas/{schema}/tables/{table}/changes':
get:
operationId: 'GetTableChanges'
summary: 'Read Change Data Feed from a Table'
description: |
This is the API for clients to read change data feed from a table.
The API supports a start parameter and and an end parameter. The
start/end parameter can either be a version or a timestamp. The start
parameter must be provided. If the end parameter is not provided, the
API will use the latest table version for it. The parameter range is
inclusive in the query. You can specify a version as a Long or a
timestamp as a string in the Timestamp Format.
The change data feed represents row-level changes between versions of
a Delta table. It records change data for UPDATE, DELETE, and MERGE operations.
If you leverage the connectors provided by this library to read change data feed,
it results in three metadata columns that identify the type of change event, in
addition to the data columns:
_change_type (type: String): There are four values: insert, update_preimage, update_postimage, delete. preimage is the value before the udpate, postimage is the value after the update.
_commit_version (type: Long): The table version containing the change.
_commit_timestamp (type: Long): The unix timestamp associated when the commit of the change was created, in milliseconds.
tags:
- tables
- official
parameters:
- in: path
name: share
required: true
description: 'Named share for finding the named schema'
schema:
type: string
- in: path
name: schema
required: true
description: 'Named schema for finding the named table'
schema:
type: string
- in: path
name: table
required: true
description: 'Named table'
schema:
type: string
- in: query
name: startingTimestamp
required: false
description: 'The starting timestamp of the query, a string in the Timestamp Format, which will be converted to a version created greater or equal to this timestamp. '
schema:
type: string
- in: query
name: startingVersion
required: false
description: 'The starting version of the query, inclusive.'
schema:
type: integer
- in: query
name: endingVersion
required: false
description: 'The ending version of the query, inclusive.'
schema:
type: integer
- in: query
name: endingTimestamp
required: false
description: 'The starting timestamp of the query, a string in the Timestamp Format, which will be converted to a version created greater or equal to this timestamp. '
schema:
type: string
- in: query
name: includeHistoricalMetadata
required: false
description: 'If set to true, return the historical metadata if seen in the delta log. This is for the streaming client to check if the table schema is still read compatible.'
schema:
type: boolean
responses:
'400':
$ref: "#/components/responses/400"
'401':
$ref: "#/components/responses/401"
'403':
$ref: "#/components/responses/403"
'404':
$ref: "#/components/responses/404"
'500':
$ref: "#/components/responses/500"
'200':
description: 'This is the API for clients to read change data feed from a table.'
content:
'application/x-ndjson':
schema:
$ref: '#/components/schemas/ChangeDataFeedResponse'
components:
securitySchemes:
BearerAuth:
type: http
scheme: bearer
schemas:
Ops:
type: string
enum:
- column
- literal
- isNull
- equal
- lessThan
- lessThanOrEqual
- greaterThan
- greaterThanOrEqual
- and
- or
- not
description: |
Op Op Type Description
column Leaf Represents a column. A column op has two fields: name and valueType. The column's value will be cast to the specified valueType during comparisons.
literal Leaf Represents a literal or fixed value. A literal op has two fields: value and valueType. The literal's value will be cast to the specified valueType during comparisons.
isNull Unary Represents a null check on a column op. This op should have only one child, the column op.
equal Binary Represents an equality ("=") check. This op should have two children, and both should be leaf ops.
lessThan Binary Represents a less than ("<") check. This op should have two children, and both should be leaf ops.
lessThanOrEqual Binary Represents a less than or equal ("<=") check. This op should have two children, and both should be leaf ops.
greaterThan Binary Represents a greater than (">") check. This op should have two children, and both should be leaf ops.
greaterThanOrEqual Binary Represents a greater than (">=") check. This op should have two children, and both should be leaf ops.
and Nary Represents a logical and operation amongst its children. This op should have at least two children.
or Nary Represents a logical or operation amongst its children. This op should have at least two children.
not Unary Represents a logical not check. This op should have once child.
The supported value types:
ValueType Description
"bool" Represents an Boolean type.
"int" Represents an Integer type.
"long" Represents a Long type.
"string" Represents a String type.
"date" Represents a Date type in "yyyy-mm-dd" format.
ListShareResponse:
type: object
required:
- nextPageToken
properties:
nextPageToken: &nextPageToken
type: string
items:
type: array
items:
$ref: '#/components/schemas/Share'
Share:
type: object
required:
- name
properties:
name: &shareName
type: string
example: 'vaccine_share'
id:
type: string
example: 'edacc4a7-6600-4fbb-85f3-a62a5ce6761f'
ListSchemasResponse:
type: object
required:
- nextPageToken
properties:
nextPageToken: *nextPageToken
items:
type: array
items:
$ref: '#/components/schemas/Schema'
Schema:
type: object
properties:
name: &schemaName
type: string
example: 'acme_vaccine_data'
share: *shareName
ListTablesResponse:
type: object
required:
- nextPageToken
properties:
nextPageToken: *nextPageToken
items:
type: array
items:
$ref: '#/components/schemas/Table'
Table:
type: object
properties:
name: &tableName
type: string
example: 'vaccine_ingredients'
share: *shareName
schema: *schemaName
TableMetadataResponse:
type: string
example: |
{"protocol":{"minReaderVersion":1}}
{"metaData":{"id":"f8d5c169-3d01-4ca3-ad9e-7dc3355aedb2","format":{"provider":"parquet"},"schemaString":"{\"type\":\"struct\",\"fields\":[{\"name\":\"eventTime\",\"type\":\"timestamp\",\"nullable\":true,\"metadata\":{}},{\"name\":\"date\",\"type\":\"date\",\"nullable\":true,\"metadata\":{}}]}","partitionColumns":["date"]}}
QueryRequest:
type: object
properties:
predicateHints:
type: array
description: |
a list of SQL boolean expressions using a restricted subset of SQL, in a JSON array.
When it’s present, the server will use the provided predicates as a hint to apply the
SQL predicates on the returned files. Filtering files based on the SQL predicates
is BEST EFFORT. The server may return files that don’t satisfy the predicates.
If the server fails to parse one of the SQL predicates, or fails to evaluate it, the
server may skip it. Predicate expressions are conjunctive (AND-ed together).
When it’s absent, the server will return all of files in the table.
This will be deprecated once all the client and server implementation move to using jsonPredicateHints below.
example:
- 'col = 123'
items:
type: string
jsonPredicateHints:
type: object
description: |
query predicates on partition columns specified using a structured JSON format.
When it’s present, the server will try to use the predicates to filter table's
files, which could boost query performance.
As with predicateHints, this filtering is BEST EFFORT. The server may return files
that don’t satisfy the predicates.
If the server encounters any errors during predicate processing (for example, invalid
syntax or non existing columns), it will skip filtering and return all the files.
When it’s absent, the server will return all the files in the table.
properties:
op:
$ref: '#/components/schemas/Ops'
children:
type: string
name:
type: string
value:
type: string
valueType:
type: string
limitHint:
type: integer
example: 1000
description: |
It’s a hint from the client to tell the server how many rows the
client plans to read. The server can use this hint to return only
some files by using the stats in the Delta transaction logs. For
example, when running SELECT * FROM table LIMIT 1000, the client
can send limit=1000 to the server
version:
type: integer
description: |
an optional version number. If set, will return files as of the
specified version of the table. This is only supported on tables
with history sharing enabled.
example: 1005
timestamp:
type: string
example: yyyy-[m]m-[d]d hh:mm:ss[.f...]
description: |
an optional timestamp string in the Timestamp Format,. If set, will
return files as of the table version corresponding to the specified
timestamp. This is only supported on tables with history sharing enabled.
startingVersion:
type: integer
example: 1000
description: |
an optional version number. If set, will return all data change files
since startingVersion, inclusive, including historical metadata if seen
in the delta log.
endingVersion:
type: integer
example: 1000
description: |
an optional version number, only used if startingVersion is set. If set,
the server can use it as a hint to avoid returning data change files after
endingVersion. This is not enforcement. Hence, when sending the endingVersion
parameter, the client should still handle the case that it may receive files
after endingVersion.
TableQueryResponse:
type: string
example: |
{"protocol":{"minReaderVersion":1}}
{"metaData":{"id":"f8d5c169-3d01-4ca3-ad9e-7dc3355aedb2","format":{"provider":"parquet"},"schemaString":"{\"type\":\"struct\",\"fields\":[{\"name\":\"eventTime\",\"type\":\"timestamp\",\"nullable\":true,\"metadata\":{}},{\"name\":\"date\",\"type\":\"date\",\"nullable\":true,\"metadata\":{}}]}","partitionColumns":["date"]}}
{"file":{"url":"https://<s3-bucket-name>.s3.us-west-2.amazonaws.com/delta-exchange-test/table2/date%3D2021-04-28/part-00000-8b0086f2-7b27-4935-ac5a-8ed6215a6640.c000.snappy.parquet?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210501T010516Z&X-Amz-SignedHeaders=host&X-Amz-Expires=900&X-Amz-Credential=AKIAISZRDL4Q4Q7AIONA%2F20210501%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Signature=97b6762cfd8e4d7e94b9d707eff3faf266974f6e7030095c1d4a66350cfd892e","id":"8b0086f2-7b27-4935-ac5a-8ed6215a6640","partitionValues":{"date":"2021-04-28"},"size":573,"stats":"{\"numRecords\":1,\"minValues\":{\"eventTime\":\"2021-04-28T23:33:57.955Z\"},\"maxValues\":{\"eventTime\":\"2021-04-28T23:33:57.955Z\"},\"nullCount\":{\"eventTime\":0}}"}}
{"file":{"url":"https://<s3-bucket-name>.s3.us-west-2.amazonaws.com/delta-exchange-test/table2/date%3D2021-04-28/part-00000-591723a8-6a27-4240-a90e-57426f4736d2.c000.snappy.parquet?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210501T010516Z&X-Amz-SignedHeaders=host&X-Amz-Expires=899&X-Amz-Credential=AKIAISZRDL4Q4Q7AIONA%2F20210501%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Signature=0f7acecba5df7652457164533a58004936586186c56425d9d53c52db574f6b62","id":"591723a8-6a27-4240-a90e-57426f4736d2","partitionValues":{"date":"2021-04-28"},"size":573,"stats":"{\"numRecords\":1,\"minValues\":{\"eventTime\":\"2021-04-28T23:33:48.719Z\"},\"maxValues\":{\"eventTime\":\"2021-04-28T23:33:48.719Z\"},\"nullCount\":{\"eventTime\":0}}"}}
ChangeDataFeedResponse:
type: string
example: |
{"protocol": {"minReaderVersion": 1}}
{"metaData": {"id": "f8d5c169-3d01-4ca3-ad9e-7dc3355aedb2","format": {"provider": "parquet"},"schemaString": "{\"type\":\"struct\",\"fields\":[{\"name\":\"eventTime\",\"type\":\"timestamp\",\"nullable\":true,\"metadata\":{}},{\"name\":\"date\",\"type\":\"date\",\"nullable\":true,\"metadata\":{}}]}","partitionColumns": ["date"],"configuration": {"enableChangeDataFeed": "true"}}}{"add": {"url": "https://<s3-bucket-name>.s3.us-west-2.amazonaws.com/delta-exchange-test/table_cdf/date%3D2021-04-28/part-00000-8b0086f2-7b27-4935-ac5a-8ed6215a6640.c000.snappy.parquet?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210501T010516Z&X-Amz-SignedHeaders=host&X-Amz-Expires=900&X-Amz-Credential=AKIAISZRDL4Q4Q7AIONA%2F20210501%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Signature=97b6762cfd8e4d7e94b9d707eff3faf266974f6e7030095c1d4a66350cfd892e","id": "8b0086f2-7b27-4935-ac5a-8ed6215a6640","partitionValues": {"date": "2021-04-28"},"size":573,"stats": "{\"numRecords\":1,\"minValues\":{\"eventTime\":\"2021-04-28T23:33:57.955Z\"},\"maxValues\":{\"eventTime\":\"2021-04-28T23:33:57.955Z\"},\"nullCount\":{\"eventTime\":0}}","timestamp": 1652140000000,"version": 0}}
{"cdf": {"url": "https://<s3-bucket-name>.s3.us-west-2.amazonaws.com/delta-exchange-test/table_cdf/_change_data/date%3D2021-04-28/part-00000-591723a8-6a27-4240-a90e-57426f4736d2.c000.snappy.parquet?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210501T010516Z&X-Amz-SignedHeaders=host&X-Amz-Expires=899&X-Amz-Credential=AKIAISZRDL4Q4Q7AIONA%2F20210501%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Signature=0f7acecba5df7652457164533a58004936586186c56425d9d53c52db574f6b62","id": "591723a8-6a27-4240-a90e-57426f4736d2","partitionValues": {"date": "2021-04-28"},"size": 689,"timestamp": 1652141000000,"version": 1}}
{"remove": {"url": "https://<s3-bucket-name>.s3.us-west-2.amazonaws.com/delta-exchange-test/table_cdf/date%3D2021-04-28/part-00000-8b0086f2-7b27-4935-ac5a-8ed6215a6640.c000.snappy.parquet?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210501T010516Z&X-Amz-SignedHeaders=host&X-Amz-Expires=900&X-Amz-Credential=AKIAISZRDL4Q4Q7AIONA%2F20210501%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Signature=97b6762cfd8e4d7e94b9d707eff3faf266974f6e7030095c1d4a66350cfd892e","id": "8b0086f2-7b27-4935-ac5a-8ed6215a6640","partitionValues": {"date": "2021-04-28"},"size": 573,"timestamp": 1652142000000,"version": 2}}
CommonErrorResponse:
type: object
properties:
errorCode:
type: string
message:
type: string
responses:
400:
description: The request is malformed
content:
application/json:
schema:
$ref: '#/components/schemas/CommonErrorResponse'
401:
description: The request is unauthenticated. The bearer token is missing or incorrect
content:
application/json:
schema:
$ref: '#/components/schemas/CommonErrorResponse'
403:
description: The request is forbidden from being fulfilled
content:
application/json:
schema:
$ref: '#/components/schemas/CommonErrorResponse'
404:
description: The specified resource was not found
content:
application/json:
schema:
$ref: '#/components/schemas/CommonErrorResponse'
500:
description: The request is not handled correctly due to a server error
content:
application/json:
schema:
$ref: '#/components/schemas/CommonErrorResponse'