SQL

Flowtide has SQL support which will transform the SQL into a substrait plan which can then be run the engine.

To create a plan from SQL, add the following code to your application:

var sqlBuilder = new SqlPlanBuilder();

sqlBuilder.Sql(@"
CREATE TABLE testtable (
  val any
);

INSERT INTO output
SELECT t.val FROM testtable t
");

var plan = sqlBuilder.GetPlan();

info

All SQL plans must have a source and a sink, so it must always insert to somewhere. The INSERT INTO denotes which output should leave the stream.

You can find more information in the following chapters:

📄️ Table Provider

It is possible to add table providers to the SqlPlanBuilder. These providers are called each time the compiler finds the usage of a table.

📄️ Create Table

The CREATE TABLE data definition is used to add metadata about a table to the SqlPlanBuilder.

📄️ Create View

The create view command allows you to define a reusable sub-plan.

🗃️ Select

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📄️ Insert Into

The INSERT INTO statement is used to send data from the stream into a sink. Each stream requires at least one insert into statement to mark which data should be output from the stream.

📄️ Recursion

Flowtide also supports recusive queries, such as iterating over a tree structure. This is done with the WITH statement, and works similar as in other databases.