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Questions tagged [flink-sql]

Apache Flink features two relational APIs, SQL and Table API, as unified APIs for stream and batch processing.

Apache Flink features two relational APIs:

  1. SQL (via Apache Calcite)
  2. Table API, a language-integrated query (LINQ) interface

Both APIs are unified APIs for stream and batch processing. This means that the a query returns the same result regardless whether it is applied on a static data set or a data stream. SQL queries are parsed and optimized by Apache Calcite (Table API queries are optimized by Calcite).

Both APIs are tightly integrated with Flink's DataStream and DataSet APIs.

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Flink 1.4 Column 'rowtime' not found in any table

I am following the documentation to configure a TableSource with a rowtime attribute. I register the timestamp field as follows KafkaTableSource source = Kafka08JsonTableSource.builder()// set Kafka topic .forTopic("alerting") …
Xuan
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Flink RuntimeException while trying to group data using Table API

My project intend to use Flink for data processing. We have a Kafka topic and using that topic we want to aggregate data using Flink. Following is my sample code StreamExecutionEnvironment env =…
Viraj
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Apache Flink: LEFT JOIN with a TableFunction does not return expected result

Flink version: 1.3.1 I created two tables, one is from memory, another is from UDTF. When I tested join and left join, they returned the same result. What I expected was left join had more rows than join. My test code is this: public class…
yafeng zhao
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How can I map each field of an event to a separate column when creating a table using Flink Table API from a data-stream of Confluent Avro?

How to create table using Table Api in flink for modelling I am working on creating a table using Table API from the data-stream of confluent-avro (from kafka topic). I am trying using the below code ( Flink version is 1.17) and it is creating table…
Shiv Desai
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How to submit a job to the standalone standalone using sql-cli

I followed the example in the link below, but got an error https://nightlies.apache.org/flink/flink-docs-release-1.16/docs/dev/table/sqlclient/ enter image description here org.apache.flink.table.client.gateway.SqlExecutionException: Could not…
Paddy
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Flink streaming parameters to tune?

I am currently working on a project titled by Automatic Tuning for Flink streaming framework. Basically, we aim to create a model(Reinforcement learning agent) to select the best values for Flink parameters. Such a problem occurs in the Spark…
Maher Marwani
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Use-Defined Aggregate Function in Flink - No match found for function signature

i would like to keep all raw rows per key in "Select .. From .. GROUP BY .." query in Flink. I defined a AggregateFunction called RowToJsonAgg which aggregates rows into a Json string. class RowToJsonAgg extends AggregateFunction[String,…
Grant
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