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qc: Reveal function usage

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MXS-1070

Just interface changes. Implementation follow in separate changes.
This commit is contained in:
Johan Wikman
2017-01-02 17:44:15 +02:00
parent 2d849e0ab2
commit d078f56dc5
5 changed files with 205 additions and 0 deletions
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25
include/maxscale/query_classifier.h
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@ -118,6 +118,15 @@ typedef struct qc_field_info
uint32_t usage; /** Bitfield denoting where the column appears. */
} QC_FIELD_INFO;
/**
* QC_FUNCTION_INFO contains information about a function used in a statement.
*/
typedef struct qc_function_info
{
char* name; /** Name of function. */
uint32_t usage; /** Bitfield denoting where the column appears. */
} QC_FUNCTION_INFO;
/**
* QUERY_CLASSIFIER defines the object a query classifier plugin must
* implement and return.
@ -150,6 +159,7 @@ typedef struct query_classifier
char* (*qc_get_prepare_name)(GWBUF* stmt);
qc_query_op_t (*qc_get_prepare_operation)(GWBUF* stmt);
void (*qc_get_field_info)(GWBUF* stmt, const QC_FIELD_INFO** infos, size_t* n_infos);
void (*qc_get_function_info)(GWBUF* stmt, const QC_FUNCTION_INFO** infos, size_t* n_infos);
} QUERY_CLASSIFIER;
/**
@ -297,6 +307,21 @@ char* qc_field_usage_mask_to_string(uint32_t usage_mask);
*/
void qc_get_field_info(GWBUF* stmt, const QC_FIELD_INFO** infos, size_t* n_infos);
/**
* Returns information about function usage.
*
* @param stmt A buffer containing a COM_QUERY packet.
* @param infos Pointer to pointer that after the call will point to an
* array of QC_FUNCTION_INFO:s.
* @param n_infos Pointer to size_t variable where the number of items
* in @c infos will be returned.
*
* @note The returned array belongs to the GWBUF and remains valid for as
* long as the GWBUF is valid. If the data is needed for longer than
* that, it must be copied.
*/
void qc_get_function_info(GWBUF* stmt, const QC_FUNCTION_INFO** infos, size_t* n_infos);
/**
* Returns the statement, with literals replaced with question marks.
*