/*
* Initialize AppendOnlyStorageRead.
*
* The AppendOnlyStorageRead data structure is initialized once for a read
* "session" and can be used to read Append-Only Storage Blocks from 1 or
* more segment files.
*
* The current file to read to is opened with the
* AppendOnlyStorageRead_OpenFile routine.
*
* storageRead - data structure to initialize
* memoryContext - memory context to use for buffers and other memory
* needs. When NULL, the current memory context is used.
* maxBufferLen - maximum Append-Only Storage Block length including all
* storage headers.
* relationName - name of the relation to use in system logging and
* error messages.
* title - A phrase that better describes the purpose of this open.
* The caller manages the storage for this.
* storageAttributes - Append-Only Storage Attributes from relation creation.
*/
void
AppendOnlyStorageRead_Init(AppendOnlyStorageRead *storageRead,
MemoryContext memoryContext,
int32 maxBufferLen,
char *relationName,
char *title,
AppendOnlyStorageAttributes *storageAttributes)
{
int relationNameLen;
uint8 *memory;
int32 memoryLen;
MemoryContext oldMemoryContext;
Assert(storageRead != NULL);
/* UNDONE: Range check maxBufferLen */
Assert(relationName != NULL);
Assert(storageAttributes != NULL);
/* UNDONE: Range check fields in storageAttributes */
MemSet(storageRead, 0, sizeof(AppendOnlyStorageRead));
storageRead->maxBufferLen = maxBufferLen;
if (memoryContext == NULL)
storageRead->memoryContext = CurrentMemoryContext;
else
storageRead->memoryContext = memoryContext;
oldMemoryContext = MemoryContextSwitchTo(storageRead->memoryContext);
memcpy(&storageRead->storageAttributes,
storageAttributes,
sizeof(AppendOnlyStorageAttributes));
relationNameLen = strlen(relationName);
storageRead->relationName = (char *) palloc(relationNameLen + 1);
memcpy(storageRead->relationName, relationName, relationNameLen + 1);
storageRead->title = title;
storageRead->minimumHeaderLen =
AppendOnlyStorageFormat_RegularHeaderLenNeeded(
storageRead->storageAttributes.checksum);
/*
* Initialize BufferedRead.
*/
storageRead->largeReadLen = 2 * storageRead->maxBufferLen;
memoryLen = BufferedReadMemoryLen(storageRead->maxBufferLen,
storageRead->largeReadLen);
Assert(CurrentMemoryContext == storageRead->memoryContext);
memory = (uint8 *) palloc(memoryLen);
BufferedReadInit(&storageRead->bufferedRead,
memory,
memoryLen,
storageRead->maxBufferLen,
storageRead->largeReadLen,
relationName);
elogif(Debug_appendonly_print_scan || Debug_appendonly_print_read_block, LOG,
"Append-Only Storage Read initialize for table '%s' "
"(compression = %s, compression level %d, maximum buffer length %d, large read length %d)",
storageRead->relationName,
(storageRead->storageAttributes.compress ? "true" : "false"),
storageRead->storageAttributes.compressLevel,
storageRead->maxBufferLen,
storageRead->largeReadLen);
storageRead->file = -1;
storageRead->formatVersion = -1;
MemoryContextSwitchTo(oldMemoryContext);
storageRead->isActive = true;
}
/*
* Initialize AppendOnlyStorageRead.
*
* The AppendOnlyStorageRead data structure is initialized
* once for a read "session" and can be used to read
* Append-Only Storage Blocks from 1 or more segment files.
*
* The current file to read to is opened with the
* AppendOnlyStorageRead_OpenFile routine.
*/
void AppendOnlyStorageRead_Init(
AppendOnlyStorageRead *storageRead,
/* The data structure to initialize. */
MemoryContext memoryContext,
/*
* The memory context to use for buffers and
* other memory needs. When NULL, the
* current memory context is used.
*/
int32 maxBufferLen,
/*
* The maximum Append-Only Storage Block
* length including all storage headers.
*/
char *relationName,
/*
* Name of the relation to use in system
* logging and error messages.
*/
char *title,
/*
* A phrase that better describes the purpose of the this open.
*
* The caller manages the storage for this.
*/
AppendOnlyStorageAttributes *storageAttributes)
/*
* The Append-Only Storage Attributes
* from relation creation.
*/
{
int relationNameLen;
uint8 *memory;
int32 memoryLen;
MemoryContext oldMemoryContext;
Assert(storageRead != NULL);
// UNDONE: Range check maxBufferLen
Assert(relationName != NULL);
Assert(storageAttributes != NULL);
// UNDONE: Range check fields in storageAttributes
MemSet(storageRead, 0, sizeof(AppendOnlyStorageRead));
storageRead->maxBufferLen = maxBufferLen;
if (memoryContext == NULL)
storageRead->memoryContext = CurrentMemoryContext;
else
storageRead->memoryContext = memoryContext;
oldMemoryContext = MemoryContextSwitchTo(storageRead->memoryContext);
memcpy(
&storageRead->storageAttributes,
storageAttributes,
sizeof(AppendOnlyStorageAttributes));
relationNameLen = strlen(relationName);
storageRead->relationName = (char *) palloc(relationNameLen + 1);
memcpy(storageRead->relationName, relationName, relationNameLen + 1);
storageRead->title = title;
storageRead->minimumHeaderLen =
AppendOnlyStorageFormat_RegularHeaderLenNeeded(
storageRead->storageAttributes.checksum);
/*
* Initialize BufferedRead.
*/
storageRead->largeReadLen = 2 * storageRead->maxBufferLen;
memoryLen =
BufferedReadMemoryLen(
storageRead->maxBufferLen,
storageRead->largeReadLen);
Assert(CurrentMemoryContext == storageRead->memoryContext);
memory = (uint8*)palloc(memoryLen);
BufferedReadInit(&storageRead->bufferedRead,
memory,
memoryLen,
storageRead->maxBufferLen,
storageRead->largeReadLen,
relationName);
elogif(Debug_appendonly_print_scan || Debug_appendonly_print_read_block, LOG,
"Append-Only Storage Read initialize for table '%s' "
"(compression = %s, compression level %d, maximum buffer length %d, large read length %d)",
storageRead->relationName,
(storageRead->storageAttributes.compress ? "true" : "false"),
storageRead->storageAttributes.compressLevel,
storageRead->maxBufferLen,
storageRead->largeReadLen);
storageRead->file = -1;
MemoryContextSwitchTo(oldMemoryContext);
storageRead->isActive = true;
}
