Use more samples [skip ci]

src/ivfbuild.c

@@ -419,7 +419,7 @@ ComputeCenters(IvfflatBuildState * buildstate)
 
 	/* Target 50 samples per list, with at least 10000 samples */
 	/* The number of samples has a large effect on index build time */
-	numSamples = buildstate->lists * 50;
+	numSamples = buildstate->lists * 200;
 	if (numSamples < 10000)
 		numSamples = 10000;
 

src/vector.c

@@ -492,6 +492,8 @@ vector_l2_squared_distance(PG_FUNCTION_ARGS)
 	double		distance = 0.0;
 	double		diff;
 
+	CheckDims(a, b);
+
 	/* Auto-vectorized */
 	for (int i = 0; i < a->dim; i++)
 	{