CREATE INFERRED PIPELINE

Syntax

SQL

CREATE INFERRED PIPELINE <pipeline_name> AS
    LOAD DATA {input_configuration}
    [FORMAT [CSV | JSON | AVRO | PARQUET | ICEBERG]]
    [AS JSON];

Remarks

The input_configuration specifies configuration for loading files from Apache Kafka, Amazon S3, a local filesystem, Microsoft Azure, HDFS, and Google Cloud Storage. Refer to CREATE PIPELINE for more information on configuration specifications.
All options supported by CREATE PIPELINE are supported by CREATE INFERRED PIPELINE.
CSV, JSON, Avro, Parquet, and Iceberg formats are supported.
The default format is CSV.
TEXT and ENUM types use utf8mb4 charset and utf8mb4_bin collation by default.
The AS JSON keyword is used to produce pipeline and table definitions in JSON format.

Example

The following example demonstrates how to use the CREATE INFERRED PIPELINE command to infer the schema of a Avro-formatted file in an AWS S3 bucket.

This example uses data that conforms to the schema of the books table, as shown in the following.

{"namespace": "books.avro",
"type": "record",
"name": "Book",
"fields": [
{"name": "id", "type": "int"},
{"name": "name", "type": "string"},
{"name": "num_pages", "type": "int"},
{"name": "rating", "type": "double"},
{"name": "publish_timestamp", "type": "long",
"logicalType": "timestamp-micros"} ]}

Refer to Generate an Avro File for an example of generating an Avro file that conforms to this schema.

The following example creates a pipeline named books_pipe by inferring the schema from the specified file. This command also creates a table with the same name as the pipeline. The pipeline is automatically started to allow review and adjustment of the pipeline and table definitions as required.

SQL

CREATE INFERRED PIPELINE books_pipe AS LOAD DATA S3
         's3://data_folder/books.avro'
CONFIG '{"region":"<region_name>"}'
CREDENTIALS '{
    "aws_access_key_id":"<your_access_key_id>",
    "aws_secret_access_key":"<your_secret_access_key>",
    "aws_session_token":"<your_session_token>"}'
FORMAT AVRO;

Created 'books_pipe' pipeline

Run the SHOW CREATE PIPELINE command to view the CREATE PIPELINE statement for the pipeline created by the CREATE INFERRED PIPELINE command.

SQL

SHOW CREATE PIPELINE books_pipe;

Pipeline,Create Pipeline
books_pipe,"CREATE PIPELINE `books_pipe`
AS LOAD DATA S3 's3://data-folder/books.avro'
CONFIG '{\""region\"":\""us-west-2\""}'
CREDENTIALS <CREDENTIALS REDACTED>
BATCH_INTERVAL 2500
DISABLE OUT_OF_ORDER OPTIMIZATION
DISABLE OFFSETS METADATA GC
INTO TABLE `books_pipe`
FORMAT AVRO(
    `books_pipe`.`id` <- `id`,
    `books_pipe`.`name` <- `name`,
    `books_pipe`.`num_pages` <- `num_pages`,
    `books_pipe`.`rating` <- `rating`,
    `books_pipe`.`publish_date` <- `publish_date`)"

Run the SHOW CREATE TABLE command to view the CREATE TABLE statement for the table created by the CREATE INFERRED PIPELINE command.

SQL

SHOW CREATE TABLE books_pipe;

Table,Create Table
books_pipe,"CREATE TABLE `books_pipe` (
  `id` int(11) NOT NULL,
  `name` longtext CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `num_pages` int(11) NOT NULL,
  `rating` double DEFAULT NULL,
  `publish_date` bigint(20) NOT NULL,
   SORT KEY `__UNORDERED` (),
   SHARD KEY ()
) AUTOSTATS_CARDINALITY_MODE=INCREMENTAL
AUTOSTATS_HISTOGRAM_MODE=CREATE
AUTOSTATS_SAMPLING=ON
SQL_MODE='STRICT_ALL_TABLES,NO_AUTO_CREATE_USER'"

The pipeline and table definitions can be adjusted using CREATE OR REPLACE PIPELINE (CREATE PIPELINE) and ALTER TABLE commands, respectively.

Once the pipeline and table definitions are configured, start the pipeline.

SQL

START PIPELINE books_pipe FOREGROUND;

This command starts a pipeline in the foreground and displays any errors in the client. For pipelines that run continuously, start them in the background by omitting the FOREGROUND keyword. Refer to START PIPELINE for more information.

Check if the data is loaded.

SQL

SELECT * FROM books_pipe
ORDER BY id;

+----+--------------------+-----------+--------+------------------+
| id | name               | num_pages | rating | publish_date     |
+----+--------------------+-----------+--------+------------------+
|  1 | HappyPlace         |       400 |    4.9 | 1680721200000000 |
|  2 | Legends & Lattes   |       304 |    4.9 | 1669665600000000 |
|  3 | The Vanishing Half |       352 |    4.9 | 1591124400000000 |
+----+--------------------+-----------+--------+------------------+

Refer to Schema and Pipeline Inference - Examples for more examples.