kpvdr commented on a change in pull request #263:
URL: https://github.com/apache/qpid-proton/pull/263#discussion_r448993947
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File path: c/src/core/encoder.c
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@@ -336,8 +336,10 @@ static int pni_encoder_exit(void *ctx, pn_data_t *data,
pni_node_t *node)
pn_encoder_t *encoder = (pn_encoder_t *) ctx;
char *pos;
- // Special case 0 length list
- if (node->atom.type==PN_LIST && node->children-encoder->null_count==0) {
+ // Special case 0 length list, but not as first element in an array
+ pni_node_t *parent = pn_data_node(data, node->parent);
+ if (node->atom.type==PN_LIST && node->children-encoder->null_count==0 &&
+ !(pn_is_in_array(data, parent, node) && pn_is_first_in_array(data,
parent, node))) {
Review comment:
The type opcode for array elements is encoded only once, and is
determined by the type of the first element (hence the original check).
However, the size/count fields for each list element (even empty lists) must
also be present as the data portion of each array element, and it is these that
are omitted for any empty lists following the first if this patch update is not
made. Thanks for spotting that!
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