Investigation into the low_value and high_value columns of user_tab_col_statistics, and how to read them.
create.sql: create a table and indexes.
low-high-raw.sql: Show raw values for low_value and high_value
low-high-cast1.sql: Uses utl_raw.cast_to_[number|varchar2] to display the numeric and character values for low_value and high_value
low-high-cast2.sql:
Builds on low-high-cast1.sql.
Dates cannot be converted with utl_raw.
Dbms_stats convert routines could be used but this requires creating functions if < 12.1.
Instead use the dump() function and reconstruct the dates.
Currently only NUMBER, VARCHAR2 and DATE are supported.