File: data0data.c

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/*****************************************************************************

Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

*****************************************************************************/

/********************************************************************//**
@file data/data0data.c
SQL data field and tuple

Created 5/30/1994 Heikki Tuuri
*************************************************************************/

#include "data0data.h"

#ifdef UNIV_NONINL
#include "data0data.ic"
#endif

#ifndef UNIV_HOTBACKUP
#include "rem0rec.h"
#include "rem0cmp.h"
#include "page0page.h"
#include "page0zip.h"
#include "dict0dict.h"
#include "btr0cur.h"

#include <ctype.h>
#endif /* !UNIV_HOTBACKUP */

#ifdef UNIV_DEBUG
/** Dummy variable to catch access to uninitialized fields.  In the
debug version, dtuple_create() will make all fields of dtuple_t point
to data_error. */
UNIV_INTERN byte	data_error;

# ifndef UNIV_DEBUG_VALGRIND
/** this is used to fool the compiler in dtuple_validate */
UNIV_INTERN ulint	data_dummy;
# endif /* !UNIV_DEBUG_VALGRIND */
#endif /* UNIV_DEBUG */

#ifndef UNIV_HOTBACKUP
/*********************************************************************//**
Tests if dfield data length and content is equal to the given.
@return	TRUE if equal */
UNIV_INTERN
ibool
dfield_data_is_binary_equal(
/*========================*/
	const dfield_t*	field,	/*!< in: field */
	ulint		len,	/*!< in: data length or UNIV_SQL_NULL */
	const byte*	data)	/*!< in: data */
{
	if (len != dfield_get_len(field)) {

		return(FALSE);
	}

	if (len == UNIV_SQL_NULL) {

		return(TRUE);
	}

	if (0 != memcmp(dfield_get_data(field), data, len)) {

		return(FALSE);
	}

	return(TRUE);
}

/************************************************************//**
Compare two data tuples, respecting the collation of character fields.
@return 1, 0 , -1 if tuple1 is greater, equal, less, respectively,
than tuple2 */
UNIV_INTERN
int
dtuple_coll_cmp(
/*============*/
	const dtuple_t*	tuple1,	/*!< in: tuple 1 */
	const dtuple_t*	tuple2)	/*!< in: tuple 2 */
{
	ulint	n_fields;
	ulint	i;

	ut_ad(tuple1 && tuple2);
	ut_ad(tuple1->magic_n == DATA_TUPLE_MAGIC_N);
	ut_ad(tuple2->magic_n == DATA_TUPLE_MAGIC_N);
	ut_ad(dtuple_check_typed(tuple1));
	ut_ad(dtuple_check_typed(tuple2));

	n_fields = dtuple_get_n_fields(tuple1);

	if (n_fields != dtuple_get_n_fields(tuple2)) {

		return(n_fields < dtuple_get_n_fields(tuple2) ? -1 : 1);
	}

	for (i = 0; i < n_fields; i++) {
		int		cmp;
		const dfield_t*	field1	= dtuple_get_nth_field(tuple1, i);
		const dfield_t*	field2	= dtuple_get_nth_field(tuple2, i);

		cmp = cmp_dfield_dfield(field1, field2);

		if (cmp) {
			return(cmp);
		}
	}

	return(0);
}

/*********************************************************************//**
Sets number of fields used in a tuple. Normally this is set in
dtuple_create, but if you want later to set it smaller, you can use this. */
UNIV_INTERN
void
dtuple_set_n_fields(
/*================*/
	dtuple_t*	tuple,		/*!< in: tuple */
	ulint		n_fields)	/*!< in: number of fields */
{
	ut_ad(tuple);

	tuple->n_fields = n_fields;
	tuple->n_fields_cmp = n_fields;
}

/**********************************************************//**
Checks that a data field is typed.
@return	TRUE if ok */
static
ibool
dfield_check_typed_no_assert(
/*=========================*/
	const dfield_t*	field)	/*!< in: data field */
{
	if (dfield_get_type(field)->mtype > DATA_MYSQL
	    || dfield_get_type(field)->mtype < DATA_VARCHAR) {

		fprintf(stderr,
			"InnoDB: Error: data field type %lu, len %lu\n",
			(ulong) dfield_get_type(field)->mtype,
			(ulong) dfield_get_len(field));
		return(FALSE);
	}

	return(TRUE);
}

/**********************************************************//**
Checks that a data tuple is typed.
@return	TRUE if ok */
UNIV_INTERN
ibool
dtuple_check_typed_no_assert(
/*=========================*/
	const dtuple_t*	tuple)	/*!< in: tuple */
{
	const dfield_t*	field;
	ulint		i;

	if (dtuple_get_n_fields(tuple) > REC_MAX_N_FIELDS) {
		fprintf(stderr,
			"InnoDB: Error: index entry has %lu fields\n",
			(ulong) dtuple_get_n_fields(tuple));
dump:
		fputs("InnoDB: Tuple contents: ", stderr);
		dtuple_print(stderr, tuple);
		putc('\n', stderr);

		return(FALSE);
	}

	for (i = 0; i < dtuple_get_n_fields(tuple); i++) {

		field = dtuple_get_nth_field(tuple, i);

		if (!dfield_check_typed_no_assert(field)) {
			goto dump;
		}
	}

	return(TRUE);
}
#endif /* !UNIV_HOTBACKUP */

#ifdef UNIV_DEBUG
/**********************************************************//**
Checks that a data field is typed. Asserts an error if not.
@return	TRUE if ok */
UNIV_INTERN
ibool
dfield_check_typed(
/*===============*/
	const dfield_t*	field)	/*!< in: data field */
{
	if (dfield_get_type(field)->mtype > DATA_MYSQL
	    || dfield_get_type(field)->mtype < DATA_VARCHAR) {

		fprintf(stderr,
			"InnoDB: Error: data field type %lu, len %lu\n",
			(ulong) dfield_get_type(field)->mtype,
			(ulong) dfield_get_len(field));

		ut_error;
	}

	return(TRUE);
}

/**********************************************************//**
Checks that a data tuple is typed. Asserts an error if not.
@return	TRUE if ok */
UNIV_INTERN
ibool
dtuple_check_typed(
/*===============*/
	const dtuple_t*	tuple)	/*!< in: tuple */
{
	const dfield_t*	field;
	ulint		i;

	for (i = 0; i < dtuple_get_n_fields(tuple); i++) {

		field = dtuple_get_nth_field(tuple, i);

		ut_a(dfield_check_typed(field));
	}

	return(TRUE);
}

/**********************************************************//**
Validates the consistency of a tuple which must be complete, i.e,
all fields must have been set.
@return	TRUE if ok */
UNIV_INTERN
ibool
dtuple_validate(
/*============*/
	const dtuple_t*	tuple)	/*!< in: tuple */
{
	const dfield_t*	field;
	ulint		n_fields;
	ulint		len;
	ulint		i;

	ut_ad(tuple->magic_n == DATA_TUPLE_MAGIC_N);

	n_fields = dtuple_get_n_fields(tuple);

	/* We dereference all the data of each field to test
	for memory traps */

	for (i = 0; i < n_fields; i++) {

		field = dtuple_get_nth_field(tuple, i);
		len = dfield_get_len(field);

		if (!dfield_is_null(field)) {

			const byte*	data = dfield_get_data(field);
#ifndef UNIV_DEBUG_VALGRIND
			ulint		j;

			for (j = 0; j < len; j++) {

				data_dummy  += *data; /* fool the compiler not
						      to optimize out this
						      code */
				data++;
			}
#endif /* !UNIV_DEBUG_VALGRIND */

			UNIV_MEM_ASSERT_RW(data, len);
		}
	}

	ut_a(dtuple_check_typed(tuple));

	return(TRUE);
}
#endif /* UNIV_DEBUG */

#ifndef UNIV_HOTBACKUP
/*************************************************************//**
Pretty prints a dfield value according to its data type. */
UNIV_INTERN
void
dfield_print(
/*=========*/
	const dfield_t*	dfield)	/*!< in: dfield */
{
	const byte*	data;
	ulint		len;
	ulint		i;

	len = dfield_get_len(dfield);
	data = dfield_get_data(dfield);

	if (dfield_is_null(dfield)) {
		fputs("NULL", stderr);

		return;
	}

	switch (dtype_get_mtype(dfield_get_type(dfield))) {
	case DATA_CHAR:
	case DATA_VARCHAR:
		for (i = 0; i < len; i++) {
			int	c = *data++;
			putc(isprint(c) ? c : ' ', stderr);
		}

		if (dfield_is_ext(dfield)) {
			fputs("(external)", stderr);
		}
		break;
	case DATA_INT:
		ut_a(len == 4); /* only works for 32-bit integers */
		fprintf(stderr, "%d", (int)mach_read_from_4(data));
		break;
	default:
		ut_error;
	}
}

/*************************************************************//**
Pretty prints a dfield value according to its data type. Also the hex string
is printed if a string contains non-printable characters. */
UNIV_INTERN
void
dfield_print_also_hex(
/*==================*/
	const dfield_t*	dfield)	/*!< in: dfield */
{
	const byte*	data;
	ulint		len;
	ulint		prtype;
	ulint		i;
	ibool		print_also_hex;

	len = dfield_get_len(dfield);
	data = dfield_get_data(dfield);

	if (dfield_is_null(dfield)) {
		fputs("NULL", stderr);

		return;
	}

	prtype = dtype_get_prtype(dfield_get_type(dfield));

	switch (dtype_get_mtype(dfield_get_type(dfield))) {
		dulint	id;
	case DATA_INT:
		switch (len) {
			ulint	val;
		case 1:
			val = mach_read_from_1(data);

			if (!(prtype & DATA_UNSIGNED)) {
				val &= ~0x80;
				fprintf(stderr, "%ld", (long) val);
			} else {
				fprintf(stderr, "%lu", (ulong) val);
			}
			break;

		case 2:
			val = mach_read_from_2(data);

			if (!(prtype & DATA_UNSIGNED)) {
				val &= ~0x8000;
				fprintf(stderr, "%ld", (long) val);
			} else {
				fprintf(stderr, "%lu", (ulong) val);
			}
			break;

		case 3:
			val = mach_read_from_3(data);

			if (!(prtype & DATA_UNSIGNED)) {
				val &= ~0x800000;
				fprintf(stderr, "%ld", (long) val);
			} else {
				fprintf(stderr, "%lu", (ulong) val);
			}
			break;

		case 4:
			val = mach_read_from_4(data);

			if (!(prtype & DATA_UNSIGNED)) {
				val &= ~0x80000000;
				fprintf(stderr, "%ld", (long) val);
			} else {
				fprintf(stderr, "%lu", (ulong) val);
			}
			break;

		case 6:
			id = mach_read_from_6(data);
			fprintf(stderr, "{%lu %lu}",
				ut_dulint_get_high(id),
				ut_dulint_get_low(id));
			break;

		case 7:
			id = mach_read_from_7(data);
			fprintf(stderr, "{%lu %lu}",
				ut_dulint_get_high(id),
				ut_dulint_get_low(id));
			break;
		case 8:
			id = mach_read_from_8(data);
			fprintf(stderr, "{%lu %lu}",
				ut_dulint_get_high(id),
				ut_dulint_get_low(id));
			break;
		default:
			goto print_hex;
		}
		break;

	case DATA_SYS:
		switch (prtype & DATA_SYS_PRTYPE_MASK) {
		case DATA_TRX_ID:
			id = mach_read_from_6(data);

			fprintf(stderr, "trx_id " TRX_ID_FMT,
				TRX_ID_PREP_PRINTF(id));
			break;

		case DATA_ROLL_PTR:
			id = mach_read_from_7(data);

			fprintf(stderr, "roll_ptr {%lu %lu}",
				ut_dulint_get_high(id), ut_dulint_get_low(id));
			break;

		case DATA_ROW_ID:
			id = mach_read_from_6(data);

			fprintf(stderr, "row_id {%lu %lu}",
				ut_dulint_get_high(id), ut_dulint_get_low(id));
			break;

		default:
			id = mach_dulint_read_compressed(data);

			fprintf(stderr, "mix_id {%lu %lu}",
				ut_dulint_get_high(id), ut_dulint_get_low(id));
		}
		break;

	case DATA_CHAR:
	case DATA_VARCHAR:
		print_also_hex = FALSE;

		for (i = 0; i < len; i++) {
			int c = *data++;

			if (!isprint(c)) {
				print_also_hex = TRUE;

				fprintf(stderr, "\\x%02x", (unsigned char) c);
			} else {
				putc(c, stderr);
			}
		}

		if (dfield_is_ext(dfield)) {
			fputs("(external)", stderr);
		}

		if (!print_also_hex) {
			break;
		}

		data = dfield_get_data(dfield);
		/* fall through */

	case DATA_BINARY:
	default:
print_hex:
		fputs(" Hex: ",stderr);

		for (i = 0; i < len; i++) {
			fprintf(stderr, "%02lx", (ulint) *data++);
		}

		if (dfield_is_ext(dfield)) {
			fputs("(external)", stderr);
		}
	}
}

/*************************************************************//**
Print a dfield value using ut_print_buf. */
static
void
dfield_print_raw(
/*=============*/
	FILE*		f,		/*!< in: output stream */
	const dfield_t*	dfield)		/*!< in: dfield */
{
	ulint	len	= dfield_get_len(dfield);
	if (!dfield_is_null(dfield)) {
		ulint	print_len = ut_min(len, 1000);
		ut_print_buf(f, dfield_get_data(dfield), print_len);
		if (len != print_len) {
			fprintf(f, "(total %lu bytes%s)",
				(ulong) len,
				dfield_is_ext(dfield) ? ", external" : "");
		}
	} else {
		fputs(" SQL NULL", f);
	}
}

/**********************************************************//**
The following function prints the contents of a tuple. */
UNIV_INTERN
void
dtuple_print(
/*=========*/
	FILE*		f,	/*!< in: output stream */
	const dtuple_t*	tuple)	/*!< in: tuple */
{
	ulint		n_fields;
	ulint		i;

	n_fields = dtuple_get_n_fields(tuple);

	fprintf(f, "DATA TUPLE: %lu fields;\n", (ulong) n_fields);

	for (i = 0; i < n_fields; i++) {
		fprintf(f, " %lu:", (ulong) i);

		dfield_print_raw(f, dtuple_get_nth_field(tuple, i));

		putc(';', f);
		putc('\n', f);
	}

	ut_ad(dtuple_validate(tuple));
}

/**************************************************************//**
Moves parts of long fields in entry to the big record vector so that
the size of tuple drops below the maximum record size allowed in the
database. Moves data only from those fields which are not necessary
to determine uniquely the insertion place of the tuple in the index.
@return own: created big record vector, NULL if we are not able to
shorten the entry enough, i.e., if there are too many fixed-length or
short fields in entry or the index is clustered */
UNIV_INTERN
big_rec_t*
dtuple_convert_big_rec(
/*===================*/
	dict_index_t*	index,	/*!< in: index */
	dtuple_t*	entry,	/*!< in/out: index entry */
	ulint*		n_ext)	/*!< in/out: number of
				externally stored columns */
{
	mem_heap_t*	heap;
	big_rec_t*	vector;
	dfield_t*	dfield;
	dict_field_t*	ifield;
	ulint		size;
	ulint		n_fields;
	ulint		local_len;
	ulint		local_prefix_len;

	if (UNIV_UNLIKELY(!dict_index_is_clust(index))) {
		return(NULL);
	}

	if (dict_table_get_format(index->table) < DICT_TF_FORMAT_ZIP) {
		/* up to MySQL 5.1: store a 768-byte prefix locally */
		local_len = BTR_EXTERN_FIELD_REF_SIZE + DICT_MAX_INDEX_COL_LEN;
	} else {
		/* new-format table: do not store any BLOB prefix locally */
		local_len = BTR_EXTERN_FIELD_REF_SIZE;
	}

	ut_a(dtuple_check_typed_no_assert(entry));

	size = rec_get_converted_size(index, entry, *n_ext);

	if (UNIV_UNLIKELY(size > 1000000000)) {
		fprintf(stderr,
			"InnoDB: Warning: tuple size very big: %lu\n",
			(ulong) size);
		fputs("InnoDB: Tuple contents: ", stderr);
		dtuple_print(stderr, entry);
		putc('\n', stderr);
	}

	heap = mem_heap_create(size + dtuple_get_n_fields(entry)
			       * sizeof(big_rec_field_t) + 1000);

	vector = mem_heap_alloc(heap, sizeof(big_rec_t));

	vector->heap = heap;
	vector->fields = mem_heap_alloc(heap, dtuple_get_n_fields(entry)
					* sizeof(big_rec_field_t));

	/* Decide which fields to shorten: the algorithm is to look for
	a variable-length field that yields the biggest savings when
	stored externally */

	n_fields = 0;

	while (page_zip_rec_needs_ext(rec_get_converted_size(index, entry,
							     *n_ext),
				      dict_table_is_comp(index->table),
				      dict_index_get_n_fields(index),
				      dict_table_zip_size(index->table))) {
		ulint			i;
		ulint			longest		= 0;
		ulint			longest_i	= ULINT_MAX;
		byte*			data;
		big_rec_field_t*	b;

		for (i = dict_index_get_n_unique_in_tree(index);
		     i < dtuple_get_n_fields(entry); i++) {
			ulint	savings;

			dfield = dtuple_get_nth_field(entry, i);
			ifield = dict_index_get_nth_field(index, i);

			/* Skip fixed-length, NULL, externally stored,
			or short columns */

			if (ifield->fixed_len
			    || dfield_is_null(dfield)
			    || dfield_is_ext(dfield)
			    || dfield_get_len(dfield) <= local_len
			    || dfield_get_len(dfield)
			    <= BTR_EXTERN_FIELD_REF_SIZE * 2) {
				goto skip_field;
			}

			savings = dfield_get_len(dfield) - local_len;

			/* Check that there would be savings */
			if (longest >= savings) {
				goto skip_field;
			}

			/* In DYNAMIC and COMPRESSED format, store
			locally any non-BLOB columns whose maximum
			length does not exceed 256 bytes.  This is
			because there is no room for the "external
			storage" flag when the maximum length is 255
			bytes or less. This restriction trivially
			holds in REDUNDANT and COMPACT format, because
			there we always store locally columns whose
			length is up to local_len == 788 bytes.
			@see rec_init_offsets_comp_ordinary */
			if (ifield->col->mtype != DATA_BLOB
			    && ifield->col->len < 256) {
				goto skip_field;
			}

			longest_i = i;
			longest = savings;

skip_field:
			continue;
		}

		if (!longest) {
			/* Cannot shorten more */

			mem_heap_free(heap);

			return(NULL);
		}

		/* Move data from field longest_i to big rec vector.

		We store the first bytes locally to the record. Then
		we can calculate all ordering fields in all indexes
		from locally stored data. */

		dfield = dtuple_get_nth_field(entry, longest_i);
		ifield = dict_index_get_nth_field(index, longest_i);
		local_prefix_len = local_len - BTR_EXTERN_FIELD_REF_SIZE;

		b = &vector->fields[n_fields];
		b->field_no = longest_i;
		b->len = dfield_get_len(dfield) - local_prefix_len;
		b->data = (char*) dfield_get_data(dfield) + local_prefix_len;

		/* Allocate the locally stored part of the column. */
		data = mem_heap_alloc(heap, local_len);

		/* Copy the local prefix. */
		memcpy(data, dfield_get_data(dfield), local_prefix_len);
		/* Clear the extern field reference (BLOB pointer). */
		memset(data + local_prefix_len, 0, BTR_EXTERN_FIELD_REF_SIZE);
#if 0
		/* The following would fail the Valgrind checks in
		page_cur_insert_rec_low() and page_cur_insert_rec_zip().
		The BLOB pointers in the record will be initialized after
		the record and the BLOBs have been written. */
		UNIV_MEM_ALLOC(data + local_prefix_len,
			       BTR_EXTERN_FIELD_REF_SIZE);
#endif

		dfield_set_data(dfield, data, local_len);
		dfield_set_ext(dfield);

		n_fields++;
		(*n_ext)++;
		ut_ad(n_fields < dtuple_get_n_fields(entry));
	}

	vector->n_fields = n_fields;
	return(vector);
}

/**************************************************************//**
Puts back to entry the data stored in vector. Note that to ensure the
fields in entry can accommodate the data, vector must have been created
from entry with dtuple_convert_big_rec. */
UNIV_INTERN
void
dtuple_convert_back_big_rec(
/*========================*/
	dict_index_t*	index __attribute__((unused)),	/*!< in: index */
	dtuple_t*	entry,	/*!< in: entry whose data was put to vector */
	big_rec_t*	vector)	/*!< in, own: big rec vector; it is
				freed in this function */
{
	big_rec_field_t*		b	= vector->fields;
	const big_rec_field_t* const	end	= b + vector->n_fields;

	for (; b < end; b++) {
		dfield_t*	dfield;
		ulint		local_len;

		dfield = dtuple_get_nth_field(entry, b->field_no);
		local_len = dfield_get_len(dfield);

		ut_ad(dfield_is_ext(dfield));
		ut_ad(local_len >= BTR_EXTERN_FIELD_REF_SIZE);

		local_len -= BTR_EXTERN_FIELD_REF_SIZE;

		ut_ad(local_len <= DICT_MAX_INDEX_COL_LEN);

		dfield_set_data(dfield,
				(char*) b->data - local_len,
				b->len + local_len);
	}

	mem_heap_free(vector->heap);
}
#endif /* !UNIV_HOTBACKUP */