Package org.apache.flink.table.gateway.service.result

Class ResultFetcher

java.lang.Object
org.apache.flink.table.gateway.service.result.ResultFetcher
public class ResultFetcher extends Object
A fetcher to fetch result from submitted statement.

The fetcher uses the Iterator model. It means every time fetch the result with the current token, the fetcher will move forward and retire the old data.

After closes, the fetcher will not fetch the results from the remote but is able to return all data in the local cache.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    close()
     
    org.apache.flink.table.gateway.api.results.ResultSet
    fetchResults(long token, int maxFetchSize)
    Fetch results from the result store.
    org.apache.flink.table.gateway.api.results.ResultSet
    fetchResults(org.apache.flink.table.gateway.api.results.FetchOrientation orientation, int maxFetchSize)
     
    static ResultFetcher
    fromResults(org.apache.flink.table.gateway.api.operation.OperationHandle operationHandle, org.apache.flink.table.catalog.ResolvedSchema resultSchema, List<org.apache.flink.table.data.RowData> results)
     
    static ResultFetcher
    fromResults(org.apache.flink.table.gateway.api.operation.OperationHandle operationHandle, org.apache.flink.table.catalog.ResolvedSchema resultSchema, List<org.apache.flink.table.data.RowData> results, org.apache.flink.api.common.JobID jobID, org.apache.flink.table.api.ResultKind resultKind)
     
    static ResultFetcher
    fromTableResult(org.apache.flink.table.gateway.api.operation.OperationHandle operationHandle, org.apache.flink.table.api.internal.TableResultInternal tableResult, boolean isQueryResult)
     
    org.apache.flink.table.utils.print.RowDataToStringConverter
    getConverter()
     
    org.apache.flink.table.utils.print.PrintStyle
    getPrintStyle()
     
    org.apache.flink.table.catalog.ResolvedSchema
    getResultSchema()
     
    ResultStore
    getResultStore()
     
    boolean
    isQueryResult()
     
    ResultFetcher
    withResourceManager(org.apache.flink.table.resource.ResourceManager resourceManager)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • fromTableResult

      public static ResultFetcher fromTableResult(org.apache.flink.table.gateway.api.operation.OperationHandle operationHandle, org.apache.flink.table.api.internal.TableResultInternal tableResult, boolean isQueryResult)

    • fromResults

      public static ResultFetcher fromResults(org.apache.flink.table.gateway.api.operation.OperationHandle operationHandle, org.apache.flink.table.catalog.ResolvedSchema resultSchema, List<org.apache.flink.table.data.RowData> results)

    • fromResults

      public static ResultFetcher fromResults(org.apache.flink.table.gateway.api.operation.OperationHandle operationHandle, org.apache.flink.table.catalog.ResolvedSchema resultSchema, List<org.apache.flink.table.data.RowData> results, @Nullable org.apache.flink.api.common.JobID jobID, org.apache.flink.table.api.ResultKind resultKind)

    • withResourceManager

      public ResultFetcher withResourceManager(org.apache.flink.table.resource.ResourceManager resourceManager)

    • close

      public void close()

    • getResultSchema

      public org.apache.flink.table.catalog.ResolvedSchema getResultSchema()

    • isQueryResult

      public boolean isQueryResult()

    • getPrintStyle

      public org.apache.flink.table.utils.print.PrintStyle getPrintStyle()

    • getConverter

      @VisibleForTesting public org.apache.flink.table.utils.print.RowDataToStringConverter getConverter()

    • fetchResults

      public org.apache.flink.table.gateway.api.results.ResultSet fetchResults(org.apache.flink.table.gateway.api.results.FetchOrientation orientation, int maxFetchSize)

    • fetchResults

      public org.apache.flink.table.gateway.api.results.ResultSet fetchResults(long token, int maxFetchSize)
      Fetch results from the result store. It tries to return the data cached in the buffer first. If the buffer is empty, then fetch results from the ResultStore. It's possible multiple threads try to fetch results in parallel. To keep the data integration, use the synchronized to allow only one thread can fetch the result at any time.

    • getResultStore

      @VisibleForTesting public ResultStore getResultStore()