Re: [Tarantool-patches] [PATCH v5 5/8] box, datetime: datetime comparison for indices

[Serge Petrenko via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

16.08.2021 02:59, Timur Safin via Tarantool-patches пишет:
> * storage hints implemented for datetime_t values;
> * proper comparison for indices of datetime type.
>
> Part of #5941
> Part of #5946


Please, add a docbot request stating that it's now possible to store
datetime values in spaces and create indexed datetime fields.


> ---
>   src/box/field_def.c           | 18 ++++++++
>   src/box/field_def.h           |  3 ++
>   src/box/memtx_space.c         |  3 +-
>   src/box/tuple_compare.cc      | 57 ++++++++++++++++++++++++++
>   src/box/vinyl.c               |  3 +-
>   test/engine/datetime.result   | 77 +++++++++++++++++++++++++++++++++++
>   test/engine/datetime.test.lua | 35 ++++++++++++++++
>   7 files changed, 192 insertions(+), 4 deletions(-)
>   create mode 100644 test/engine/datetime.result
>   create mode 100644 test/engine/datetime.test.lua
>
> diff --git a/src/box/field_def.c b/src/box/field_def.c
> index 2682a42ee..97033d0bb 100644
> --- a/src/box/field_def.c
> +++ b/src/box/field_def.c
> @@ -194,3 +194,21 @@ field_type_by_name(const char *name, size_t len)
>   		return FIELD_TYPE_ANY;
>   	return field_type_MAX;
>   }
> +
> +const bool field_type_index_allowed[] =
> +    {
> +	/* [FIELD_TYPE_ANY]      = */ false,
> +	/* [FIELD_TYPE_UNSIGNED] = */ true,
> +	/* [FIELD_TYPE_STRING]   = */ true,
> +	/* [FIELD_TYPE_NUMBER]   = */ true,
> +	/* [FIELD_TYPE_DOUBLE]   = */ true,
> +	/* [FIELD_TYPE_INTEGER]  = */ true,
> +	/* [FIELD_TYPE_BOOLEAN]  = */ true,
> +	/* [FIELD_TYPE_VARBINARY]= */ true,
> +	/* [FIELD_TYPE_SCALAR]   = */ true,
> +	/* [FIELD_TYPE_DECIMAL]  = */ true,
> +	/* [FIELD_TYPE_UUID]     = */ true,
> +	/* [FIELD_TYPE_ARRAY]    = */ false,
> +	/* [FIELD_TYPE_MAP]      = */ false,
> +	/* [FIELD_TYPE_DATETIME] = */ true,
> +};


You wouldn't need that array if you moved
FIELD_TYPE_DATETIME above FIELD_TYPE_ARRAY
in the previous commit.

Please, do so.


> diff --git a/src/box/field_def.h b/src/box/field_def.h
> index 120b2a93d..bd02418df 100644
> --- a/src/box/field_def.h
> +++ b/src/box/field_def.h
> @@ -120,6 +120,9 @@ extern const uint32_t field_ext_type[];
>   extern const struct opt_def field_def_reg[];
>   extern const struct field_def field_def_default;
>   
> +/** helper table for checking allowed indices for types */
> +extern const bool field_type_index_allowed[];
> +
>   /**
>    * @brief Field definition
>    * Contains information about of one tuple field.
> diff --git a/src/box/memtx_space.c b/src/box/memtx_space.c
> index b71318d24..1ab16122e 100644
> --- a/src/box/memtx_space.c
> +++ b/src/box/memtx_space.c
> @@ -748,8 +748,7 @@ memtx_space_check_index_def(struct space *space, struct index_def *index_def)
>   	/* Check that there are no ANY, ARRAY, MAP parts */
>   	for (uint32_t i = 0; i < key_def->part_count; i++) {
>   		struct key_part *part = &key_def->parts[i];
> -		if (part->type <= FIELD_TYPE_ANY ||
> -		    part->type >= FIELD_TYPE_ARRAY) {
> +		if (!field_type_index_allowed[part->type]) {
>   			diag_set(ClientError, ER_MODIFY_INDEX,
>   				 index_def->name, space_name(space),
>   				 tt_sprintf("field type '%s' is not supported",
> diff --git a/src/box/tuple_compare.cc b/src/box/tuple_compare.cc
> index 9a69f2a72..110017853 100644
> --- a/src/box/tuple_compare.cc
> +++ b/src/box/tuple_compare.cc
> @@ -538,6 +538,8 @@ tuple_compare_field_with_type(const char *field_a, enum mp_type a_type,
>   						   field_b, b_type);
>   	case FIELD_TYPE_UUID:
>   		return mp_compare_uuid(field_a, field_b);
> +	case FIELD_TYPE_DATETIME:
> +		return mp_compare_datetime(field_a, field_b);
>   	default:
>   		unreachable();
>   		return 0;
> @@ -1538,6 +1540,21 @@ func_index_compare_with_key(struct tuple *tuple, hint_t tuple_hint,
>   #define HINT_VALUE_DOUBLE_MAX	(exp2(HINT_VALUE_BITS - 1) - 1)
>   #define HINT_VALUE_DOUBLE_MIN	(-exp2(HINT_VALUE_BITS - 1))
>   
> +/**
> + * We need to squeeze 64 bits of seconds and 32 bits of nanoseconds
> + * into 60 bits of hint value. The idea is to represent wide enough
> + * years range, and leave the rest of bits occupied from nanoseconds part:
> + * - 36 bits is enough for time range of [208BC..4147]
> + * - for nanoseconds there is left 24 bits, which are MSB part of
> + *   32-bit value
> + */
> +#define HINT_VALUE_SECS_BITS	36
> +#define HINT_VALUE_NSEC_BITS	(HINT_VALUE_BITS - HINT_VALUE_SECS_BITS)
> +#define HINT_VALUE_SECS_MAX	((1LL << HINT_VALUE_SECS_BITS) - 1)

Am I missing something?
n bits may store values from (-2^(n-1)) to 2^(n-1)-1

should be (1LL << (HINT_VALUE_SECS_BITS -1))  - 1 ?


> +#define HINT_VALUE_SECS_MIN	(-(1LL << HINT_VALUE_SECS_BITS))




should be

#define HINT_VALUE_SECS_MIN	(-(1LL << (HINT_VALUE_SECS_BITS - 1)))

?


> +#define HINT_VALUE_NSEC_SHIFT	(sizeof(int) * CHAR_BIT - HINT_VALUE_NSEC_BITS)
> +#define HINT_VALUE_NSEC_MAX	((1ULL << HINT_VALUE_NSEC_BITS) - 1)
> +
>   /*
>    * HINT_CLASS_BITS should be big enough to store any mp_class value.
>    * Note, ((1 << HINT_CLASS_BITS) - 1) is reserved for HINT_NONE.
> @@ -1630,6 +1647,25 @@ hint_uuid_raw(const char *data)
>   	return hint_create(MP_CLASS_UUID, val);
>   }
>   
> +static inline hint_t
> +hint_datetime(struct datetime *date)
> +{
> +	/*
> +	 * Use at most HINT_VALUE_SECS_BITS from datetime
> +	 * seconds field as a hint value, and at MSB part
> +	 * of HINT_VALUE_NSEC_BITS from nanoseconds.
> +	 */
> +	int64_t secs = date->secs;
> +	int32_t nsec = date->nsec;
> +	uint64_t val = secs <= HINT_VALUE_SECS_MIN ? 0 :
> +			secs - HINT_VALUE_SECS_MIN;
> +	if (val >= HINT_VALUE_SECS_MAX)
> +		val = HINT_VALUE_SECS_MAX;
> +	val <<= HINT_VALUE_NSEC_BITS;
> +	val |= (nsec >> HINT_VALUE_NSEC_SHIFT) & HINT_VALUE_NSEC_MAX;
> +	return hint_create(MP_CLASS_DATETIME, val);
> +}
> +

<stripped>

-- 
Serge Petrenko