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Remove an unnecessary parameter from selectInnerLoop(). Clean up comments.

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FossilOrigin-Name: 5e6c4a55f6df30da9dbaa8170f3223613cc86f65
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drh
2014-01-22 00:23:49 +00:00
parent e73f059093
commit 340309fd69
5 changed files with 93 additions and 94 deletions
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54
src/sqliteInt.h
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@@ -2167,8 +2167,58 @@ struct Select {
/*
** The results of a select can be distributed in several ways. The
** "SRT" prefix means "SELECT Result Type".
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros. The "SRT" prefix means "SELECT Result
** Type".
**
** SRT_Union Store results as a key in a temporary index
** identified by pDest->iSDParm.
**
** SRT_Except Remove results from the temporary index pDest->iSDParm.
**
** SRT_Exists Store a 1 in memory cell pDest->iSDParm if the result
** set is not empty.
**
** SRT_Discard Throw the results away. This is used by SELECT
** statements within triggers whose only purpose is
** the side-effects of functions.
**
** All of the above are free to ignore their ORDER BY clause. Those that
** follow must honor the ORDER BY clause.
**
** SRT_Output Generate a row of output (using the OP_ResultRow
** opcode) for each row in the result set.
**
** SRT_Mem Only valid if the result is a single column.
** Store the first column of the first result row
** in register pDest->iSDParm then abandon the rest
** of the query. This destination implies "LIMIT 1".
**
** SRT_Set The result must be a single column. Store each
** row of result as the key in table pDest->iSDParm.
** Apply the affinity pDest->affSdst before storing
** results. Used to implement "IN (SELECT ...)".
**
** SRT_Table Store results in temporary table pDest->iSDParm.
** This is like SRT_EphemTab except that the table
** is assumed to already be open.
**
** SRT_EphemTab Create an temporary table pDest->iSDParm and store
** the result there. The cursor is left open after
** returning. This is like SRT_Table except that
** this destination uses OP_OpenEphemeral to create
** the table first.
**
** SRT_Coroutine Generate a co-routine that returns a new row of
** results each time it is invoked. The entry point
** of the co-routine is stored in register pDest->iSDParm
** and the result row is stored in pDest->nDest registers
** starting with pDest->iSdst.
**
** SRT_DistTable Store results in a temporary table pDest->iSDParm.
** But also use temporary table pDest->iSDParm+1 as
** a record of all prior results and ignore any duplicate
** rows. Name means: "Distinct Table".
*/
#define SRT_Union 1 /* Store result as keys in an index */
#define SRT_Except 2 /* Remove result from a UNION index */