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Diffstat (limited to 'mysql-test/include/diff_tables.inc')
| -rw-r--r-- | mysql-test/include/diff_tables.inc | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/mysql-test/include/diff_tables.inc b/mysql-test/include/diff_tables.inc new file mode 100644 index 00000000..a566a4d7 --- /dev/null +++ b/mysql-test/include/diff_tables.inc @@ -0,0 +1,195 @@ +# ==== Purpose ==== +# +# Check if all tables in the given list are equal. The tables may have +# different names, exist in different connections, and/or reside in +# different databases. +# +# +# ==== Usage ==== +# +# --let $diff_tables= [con1:][db1.]t1, [con2:][db2.]t2, ... , [conN:][dbN.]tN +# [--let $rpl_debug= 1] +# --source include/diff_tables.inc +# +# Parameters: +# $diff_tables +# Comma-separated list of tables to compare. Each table has the form +# +# [CONNECTION:][DATABASE.]table +# +# If CONNECTION is given, then that connection is used. If +# CONNECTION is not given, then the connection of the previous +# table is used (or the current connection, if this is the first +# table). If DATABASE is given, the table is read in that +# database. If DATABASE is not given, the table is read in the +# connection's current database. +# +# $rpl_debug +# See include/rpl_init.inc +# +# +# ==== Side effects ==== +# +# - Prints "include/diff_tables.inc [$diff_tables]". +# +# - If the tables are different, prints the difference in a +# system-specific format (unified diff if supported) and generates +# an error. +# +# +# ==== Bugs ==== +# +# - It is currently not possible to use this for tables that are +# supposed to be different, because if the files are different: +# - 'diff' produces system-dependent output, +# - the output includes the absolute path of the compared files, +# - the output includes a timestamp. +# To fix that, we'd probably have to use SQL to compute the +# symmetric difference between the tables. I'm not sure how to do +# that efficiently. If we implement this, it would be nice to +# compare the table definitions too. +# +# - It actually compares the result of "SELECT * FROM table ORDER BY +# col1, col2, ..., colN INTO OUTFILE 'file'". Hence, it is assumed +# that the comparison orders for both tables are equal and that two +# rows that are equal in the comparison order cannot differ, e.g., +# by character case. + + +--let $include_filename= diff_tables.inc [$diff_tables] +--source include/begin_include_file.inc + + +if (!$rpl_debug) +{ + --disable_query_log +} + + +# Check sanity +if (`SELECT LOCATE(',', '$diff_tables') = 0`) +{ + --die ERROR IN TEST: $diff_tables must contain at least two tables (separated by comma) +} + + +# ==== Save both tables to file ==== + +# Trim off whitespace +--let $_dt_tables= `SELECT REPLACE('$diff_tables', ' ', '')` + +# Iterate over all tables +--let $_dt_outfile= +--let $_dt_prev_outfile= +while ($_dt_tables) +{ + --let $_dt_table= `SELECT SUBSTRING_INDEX('$_dt_tables', ',', 1)` + --let $_dt_tables= `SELECT SUBSTRING('$_dt_tables', LENGTH('$_dt_table') + 2)` + + # Parse connection, if any + --let $_dt_colon_index= `SELECT LOCATE(':', '$_dt_table')` + if ($_dt_colon_index) + { + --let $_dt_connection= `SELECT SUBSTRING('$_dt_table', 1, $_dt_colon_index - 1)` + --let $_dt_table= `SELECT SUBSTRING('$_dt_table', $_dt_colon_index + 1)` + --let $rpl_connection_name= $_dt_connection + --source include/rpl_connection.inc + } + + # Parse database name, if any + --let $_dt_database_index= `SELECT LOCATE('.', '$_dt_table')` + if ($_dt_database_index) + { + --let $_dt_database= `SELECT SUBSTRING('$_dt_table', 1, $_dt_database_index - 1)` + --let $_dt_table= `SELECT SUBSTRING('$_dt_table', $_dt_database_index + 1)` + } + if (!$_dt_database_index) + { + --let $_dt_database= `SELECT DATABASE()` + } + + if ($rpl_debug) + { + --echo con='$_dt_connection' db='$_dt_database' table='$_dt_table' + --echo rest of tables='$_dt_tables' + } + + # We need to sort the output files so that diff_files does not think + # the tables are different just because the rows are differently + # ordered. To this end, we first generate a string containing a + # comma-separated list of all column names. This is used in the + # ORDER BY clause of the following SELECT statement. We get the + # column names from INFORMATION_SCHEMA.COLUMNS, and we concatenate + # them with GROUP_CONCAT. Since GROUP_CONCAT is limited by the + # @@SESSION.group_concat_max_len, which is only 1024 by default, we + # first compute the total size of all columns and then increase this + # limit if needed. We restore the limit afterwards so as not to + # interfere with the test case. + + # Compute length of ORDER BY clause. + let $_dt_order_by_length= + `SELECT SUM(LENGTH(column_name) + 3) FROM information_schema.columns + WHERE table_schema = '$_dt_database' AND table_name = '$_dt_table'`; + if (!$_dt_order_by_length) + { + --echo ERROR IN TEST: table $_dt_database.$_dt_table not found in INFORMATION_SCHEMA.COLUMNS. Did you misspell it? + --die ERROR IN TEST: table not found in INFORMATION_SCHEMA. Did you misspell it? + } + --let $_dt_old_group_concat_max_len= + # Increase group_concat_max_len if needed. + if (`SELECT $_dt_order_by_length > @@SESSION.group_concat_max_len`) + { + --let $_dt_old_group_concat_max_len= `SELECT @@SESSION.group_concat_max_len` + --eval SET SESSION group_concat_max_len = $_dt_order_by_length; + if ($rpl_debug) + { + --echo # increasing group_concat_max_len from $_dt_old_group_concat_max_len to $_dt_order_by_length + } + } + # Generate ORDER BY clause. + # It would be better to do GROUP_CONCAT(CONCAT('`', column_name, '`')) but + # BUG#58087 prevents us from returning strings that begin with backticks. + let $_dt_column_list= + `SELECT GROUP_CONCAT(column_name ORDER BY ORDINAL_POSITION SEPARATOR '`,`') + FROM information_schema.columns + WHERE table_schema = '$_dt_database' AND table_name = '$_dt_table'`; + # Restore group_concat_max_len. + if ($_dt_old_group_concat_max_len) + { + --let $_dt_dummy= `SET SESSION group_concat_max_len = $_dt_old_group_concat_max_len + } + if ($rpl_debug) + { + --echo using ORDER BY clause '`$_dt_column_list`' + } + + # Now that we have the comma-separated list of columns, we can write + # the table to a file. + --disable_ps2_protocol + --let $_dt_outfile= `SELECT @@datadir` + --let $_dt_outfile= $_dt_outfile/diff_table-$_dt_connection-$_dt_database-$_dt_table + eval SELECT * INTO OUTFILE '$_dt_outfile' FROM $_dt_database.$_dt_table ORDER BY `$_dt_column_list`; + --enable_ps2_protocol + + # Compare files. + if ($_dt_prev_outfile) + { + if ($rpl_debug) + { + --echo # diffing $_dt_prev_outfile vs $_dt_outfile + } + --diff_files $_dt_prev_outfile $_dt_outfile + # Remove previous outfile. Keep current file for comparison with next table. + --disable_warnings + --remove_file $_dt_prev_outfile + --enable_warnings + } + --let $_dt_prev_outfile= $_dt_outfile +} + +--disable_warnings +--remove_file $_dt_prev_outfile +--enable_warnings + +--let $include_filename= diff_tables.inc [$diff_tables] +--source include/end_include_file.inc |