liyafan82 commented on a change in pull request #6912:
URL: https://github.com/apache/arrow/pull/6912#discussion_r416559338
##########
File path:
java/vector/src/main/java/org/apache/arrow/vector/util/ValueVectorUtility.java
##########
@@ -82,4 +89,43 @@ public static String getToString(ValueVector vector, int
start, int end) {
return sb.toString();
}
+
+ /**
+ * Validate field vector.
+ */
+ public static void validate(FieldVector vector) {
+ Preconditions.checkNotNull(vector);
+
+ ArrowType arrowType = vector.getField().getType();
+ int typeBufferCount = TypeLayout.getTypeBufferCount(arrowType);
+ TypeLayout typeLayout = TypeLayout.getTypeLayout(arrowType);
+
+ if (vector.getValueCount() < 0) {
+ throw new RuntimeException("vector valueCount is negative");
+ }
+
+ if (vector.getFieldBuffers().size() != typeBufferCount) {
+ throw new RuntimeException(String.format("Expected %s buffers in vector
of type %s, got %s",
+ typeBufferCount, vector.getField().getType().toString(),
vector.getBufferSize()));
+ }
+
+ for (int i = 0; i < typeBufferCount; i++) {
+ ArrowBuf buffer = vector.getFieldBuffers().get(i);
+ BufferLayout bufferLayout = typeLayout.getBufferLayouts().get(i);
+ if (buffer == null) {
+ continue;
+ }
+ int minBufferSize = vector.getValueCount() *
bufferLayout.getTypeBitWidth();
+
+ if (buffer.capacity() < minBufferSize / 8) {
Review comment:
for offset buffers, we need to have:
int minBufferSize = (vector.getValueCount() + 1) *
bufferLayout.getTypeBitWidth();
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