Package org.apache.druid.query.extraction

Class StrlenExtractionFn

java.lang.Object
org.apache.druid.query.extraction.DimExtractionFn
org.apache.druid.query.extraction.StrlenExtractionFn
All Implemented Interfaces:
Cacheable, ExtractionFn
public class StrlenExtractionFn extends DimExtractionFn

  • Method Details

    • instance

      public static StrlenExtractionFn instance()

    • apply

      @Nullable public String apply(@Nullable String value)
      Description copied from interface: ExtractionFn
      The "extraction" function. This should map a String value into some other String value.

      Like ExtractionFn.apply(Object), the empty string is considered invalid output for this method and it should instead return null.

      Parameters:
      value - the original value of the dimension
      Returns:
      a value that should be used instead of the original

    • preservesOrdering

      public boolean preservesOrdering()
      Description copied from interface: ExtractionFn
      Offers information on whether the extraction will preserve the original ordering of the values.

      Some optimizations of queries is possible if ordering is preserved. Null values *do* count towards ordering.

      Returns:
      true if ordering is preserved, false otherwise

    • getExtractionType

      public ExtractionFn.ExtractionType getExtractionType()
      Description copied from interface: ExtractionFn
      A dim extraction can be of one of two types, renaming or rebucketing. In the `ONE_TO_ONE` case, a unique values is modified into another unique value. In the `MANY_TO_ONE` case, there is no longer a 1:1 relation between old dimension value and new dimension value
      Returns:
      ExtractionFn.ExtractionType declaring what kind of manipulation this function does

    • getCacheKey

      public byte[] getCacheKey()
      Description copied from interface: Cacheable
      Get a byte array used as a cache key.
      Returns:
      bytes to be used as cache key - or null if this object should not be cached.

    • hashCode

      public final int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      public final boolean equals(Object obj)
      Overrides:
      equals in class Object