4abf1b6b_QLite_FTS3_and_FTS4_Extensions__Interpretation
[Column] end_block [Interpretation] 
This field may contain either an integer or a text field consisting of two integers separated by a space character (unicode codepoint 0x20). The first, or only, integer is the blockid that corresponds to the interior node with the largest 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 an interior node. The second integer, if it is present, is the aggregate size of all data stored on leaf pages in bytes. If the value is negative, then the segment is the output of an unfinished incremental-merge operation, and the absolute value is current size in bytes.
SQLite FTS3 and FTS4 Extensions
Interpretation