Binding Value Of Type STRING Is Not Yet Supported For Expected Arrow Type Int(64, False)
Describe the Bug
When using a placeholder in the IN
clause of a prepared statement from a Scala application, a failure occurs due to the binding value of type STRING
not being supported for the expected Arrow type Int(64, false)
. This issue is encountered when using the JDBI library to interact with an Arrow Flight SQL database.
To Reproduce
Steps to Reproduce the Behavior
To reproduce this behavior, follow these steps:
Step 1: Set Up the Project
Create a new project using the build.sbt
file provided below:
name := "binding-value-not-supported"
version := "0.1"
scalaVersion := "2.13.12"
libraryDependencies ++= Seq(
"org.jdbi" % "jdbi" % "2.78",
"org.antlr" % "stringtemplate" % "3.2",
"org.apache.arrow" % "flight-sql-jdbc-driver" % "18.1.0",
"org.slf4j" % "slf4j-simple" % "2.0.16"
)
Step 2: Create the Configuration File
Create a spicepod.yaml
file with the following content:
datasets:
- from: file://my_table.csv
name: my_table
params:
file_format: csv
Step 3: Prepare the Data
Create a my_table.csv
file with the following content:
A,B
"1",2
"4",5
Step 4: Write the Scala Application
Create a src/main/scala/TestApp.scala
file with the following content:
import org.skife.jdbi.v2.sqlobject.{Bind, SqlQuery}
import org.skife.jdbi.v2.sqlobject.stringtemplate.UseStringTemplate3StatementLocator
import org.skife.jdbi.v2.{DBI, Handle}
import org.skife.jdbi.v2.tweak.ResultSetMapper
import scala.jdk.CollectionConverters._
case class Row(A: String, B: Int)
@UseStringTemplate3StatementLocator
trait TestAppDao {
@SqlQuery("SELECT * FROM my_table WHERE :x")
def getRow(@Bind("x") x: String): java.util.List[Row]
}
object TestApp {
def main(args: Array[String]): Unit = {
val dbi = new DBI("jdbc:arrow-flight-sql://localhost:50051?useEncryption=false", "", "")
dbi.registerMapper(new ResultSetMapper[Row] {
def map(index: Int, rs: java.sql.ResultSet, ctx: org.skife.jdbi.v2.StatementContext): Row =
Row(rs.getString("A"), rs.getInt("B"))
})
dbi.onDemand(classOf[TestAppDao]).getRow("1").asScala.foreach(println)
}
}
Step 5: Run the Application
Run the application using the following command:
sbt clean compile; sbt run
Expected Behavior
When running the application, you would expect the getRow
method to return a list of Row
objects, where each object has a string value for A
and an integer value for B
.
Actual Behavior
However, when running the application, you will encounter the following error:
[error] (Compile / run) org.skife.jdbi.v2.exceptions.UnableToExecuteStatementException: java.sql.SQLException: Binding value of type STRING is not yet supported for expected Arrow type Int(64, false)
This error indicates that the binding value of type STRING
is not supported for the expected Arrow type Int(64, false)
.
Cause of the Issue
The cause of this issue is that the getRow
method is expecting an integer value for the x
parameter, but the binding value is a string value. This is because the IN
clause in the SQL query is using a string value for the placeholder.
Solution
To solve this issue, you can modify the getRow
method to expect a string value for the x
parameter, like this:
@SqlQuery("SELECT * FROM my_table WHERE :x")
def getRow(@Bind("x") x: String): java.util.List[Row]
Alternatively, you can modify the SQL query to use an integer value for the placeholder, like this:
@SqlQuery("SELECT * FROM my_table WHERE :x::int")
def getRow(@Bind("x") x: String): java.util.List[Row]
By making this change, you can resolve the issue and retrieve the expected data from the database.
Conclusion
In this article, we have discussed a bug that occurs when using a placeholder in the IN
clause of a prepared statement from a Scala application. We have also provided a solution to this issue by modifying the getRow
method to expect a string value for the x
parameter. By following these steps, you can resolve this issue and retrieve the expected data from the database.
Q: What is the issue with the binding value of type STRING in this scenario?
A: The issue is that the binding value of type STRING is not supported for the expected Arrow type Int(64, false). This means that when the application tries to bind a string value to a parameter that is expected to be an integer, it throws an error.
Q: What is the cause of this issue?
A: The cause of this issue is that the IN
clause in the SQL query is using a string value for the placeholder. The getRow
method is expecting an integer value for the x
parameter, but the binding value is a string value.
Q: How can I resolve this issue?
A: There are two ways to resolve this issue:
- Modify the
getRow
method to expect a string value for thex
parameter, like this:
@SqlQuery("SELECT * FROM my_table WHERE :x")
def getRow(@Bind("x") x: String): java.util.List[Row]
- Modify the SQL query to use an integer value for the placeholder, like this:
@SqlQuery("SELECT * FROM my_table WHERE :x::int")
def getRow(@Bind("x") x: String): java.util.List[Row]
Q: What are the implications of this issue?
A: The implications of this issue are that the application will throw an error when trying to bind a string value to a parameter that is expected to be an integer. This can cause the application to fail and prevent it from functioning correctly.
Q: How can I prevent this issue from occurring in the future?
A: To prevent this issue from occurring in the future, you can make sure to match the data type of the binding value with the expected data type of the parameter. This can be done by using the correct data type for the parameter in the getRow
method, or by modifying the SQL query to use the correct data type for the placeholder.
Q: What are some best practices for avoiding this issue?
A: Some best practices for avoiding this issue include:
- Making sure to match the data type of the binding value with the expected data type of the parameter
- Using the correct data type for the parameter in the
getRow
method - Modifying the SQL query to use the correct data type for the placeholder
- Testing the application thoroughly to ensure that it is functioning correctly
Q: Can this issue occur in other scenarios?
A: Yes, this issue can occur in other scenarios where the binding value is not matched with the expected data type of the parameter. This can occur in any situation where the application is trying to bind a value to a parameter that is expected to have a different data type.
Q: How can I troubleshoot this issue?
A: To troubleshoot this issue, you can try the following steps:
- Check the data type of the binding value and the expected data type of the parameter
- Verify that the data type of the binding value matches the expected data type of the parameter
- Modify the
getRow
method to expect the correct data type for thex
parameter - Modify the SQL query to use the correct data type for the placeholder
By following these, you can troubleshoot and resolve the issue of the binding value of type STRING not being supported for the expected Arrow type Int(64, false).