ddsketch: expose gamma ddsketch

src/main/java/com/datadoghq/sketch/ddsketch/mapping/BitwiseLinearlyInterpolatedMapping.java

@@ -35,7 +35,7 @@ public BitwiseLinearlyInterpolatedMapping(double relativeAccuracy) {
     this(getMinNumSignificantBinaryDigits(relativeAccuracy));
   }
 
-  BitwiseLinearlyInterpolatedMapping(int numSignificantBinaryDigits) {
+  public BitwiseLinearlyInterpolatedMapping(int numSignificantBinaryDigits) {
     if (numSignificantBinaryDigits < 0) {
       throw new IllegalArgumentException(
           "The number of significant binary digits cannot be negative.");

src/main/java/com/datadoghq/sketch/ddsketch/mapping/CubicallyInterpolatedMapping.java

@@ -88,7 +88,7 @@ public CubicallyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  CubicallyInterpolatedMapping(double gamma, double indexOffset) {
+  public CubicallyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 

src/main/java/com/datadoghq/sketch/ddsketch/mapping/LinearlyInterpolatedMapping.java

@@ -25,7 +25,7 @@ public LinearlyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  LinearlyInterpolatedMapping(double gamma, double indexOffset) {
+  public LinearlyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 

src/main/java/com/datadoghq/sketch/ddsketch/mapping/LogarithmicMapping.java

@@ -21,7 +21,7 @@ public LogarithmicMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  LogarithmicMapping(double gamma, double indexOffset) {
+  public LogarithmicMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 

src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuadraticallyInterpolatedMapping.java

@@ -25,7 +25,7 @@ public QuadraticallyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  QuadraticallyInterpolatedMapping(double gamma, double indexOffset) {
+  public QuadraticallyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 

src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuarticallyInterpolatedMapping.java

@@ -29,7 +29,7 @@ public QuarticallyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  QuarticallyInterpolatedMapping(double gamma, double indexOffset) {
+  public QuarticallyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }