text: -- original: vtabH.test
  -- credit:   http://www.sqlite.org/src/tree?ci=trunk&name=test
  
  CREATE TABLE t6(a, b TEXT);
    CREATE INDEX i6 ON t6(b, a);
    CREATE VIRTUAL TABLE e6 USING echo(t6)
  ;CREATE VIRTUAL TABLE vars USING tclvar;
    SELECT * FROM vars WHERE name = 'xyz'
  ;SELECT name FROM fsdir WHERE dir = '.' AND name = 'test.db';
      SELECT name FROM fsdir WHERE dir = '.' AND name = '.'
  ;SELECT path FROM fstree WHERE path GLOB sub_pwd ORDER BY 1
  ;SELECT path, size FROM fstree WHERE path GLOB sub_pwd || '/subdir/*' ORDER BY 1
  ;SELECT path, size FROM fstree WHERE path LIKE sub_pwd || '/subdir/%' ORDER BY 1
  ;SELECT sum(size) FROM fstree WHERE path LIKE sub_pwd || '/subdir/%'
  ;SELECT size FROM fstree WHERE path = sub_pwd || '/subdir/x1.txt';