4abf1b6b_QLite_FTS3_and_FTS4_Extensions__Interpretation
[Column] start_block [Interpretation] 
The blockid that corresponds to the node with the smallest blockid that belongs to this segment b-tree. Or zero if the entire segment b-tree fits on the root node. If it exists, this node is always a leaf node.
SQLite FTS3 and FTS4 Extensions
Interpretation