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Implement collecting behaviour in qc_sqlite

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By default, only the essentials - the type and the operation - of
a statement will be collected and only if fields, tables, functions
and databases are explicitly asked for, will they be collected.
However, a statement will be parsed at most twice; if parsing is
needed a second time then all information will be collected.

If it is known that some particular information is needed, then
qc_parse() can be called explicitly to ensure it is collected
at first parsing.
This commit is contained in:
Johan Wikman
2017-03-15 17:08:57 +02:00
parent d0a9571da0
commit d70dad260a
3 changed files with 206 additions and 100 deletions
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9
include/maxscale/query_classifier.h
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@ -34,10 +34,11 @@ typedef enum qc_init_kind
*/
typedef enum qc_collect_info
{
QC_COLLECT_TABLES = 0x01, /*< Collect table names. */
QC_COLLECT_DATABASES = 0x02, /*< Collect database names. */
QC_COLLECT_FIELDS = 0x04, /*< Collect field information. */
QC_COLLECT_FUNCTIONS = 0x08, /*< Collect function information. */
QC_COLLECT_ESSENTIALS = 0x00, /*< Collect only the base minimum. */
QC_COLLECT_TABLES = 0x01, /*< Collect table names. */
QC_COLLECT_DATABASES = 0x02, /*< Collect database names. */
QC_COLLECT_FIELDS = 0x04, /*< Collect field information. */
QC_COLLECT_FUNCTIONS = 0x08, /*< Collect function information. */
QC_COLLECT_ALL = (QC_COLLECT_TABLES|QC_COLLECT_DATABASES|QC_COLLECT_FIELDS|QC_COLLECT_FUNCTIONS)
} qc_collect_info_t;