|
| 1 | +/* |
| 2 | + * This file and its contents are licensed under the Timescale License. |
| 3 | + * Please see the included NOTICE for copyright information and |
| 4 | + * LICENSE-TIMESCALE for a copy of the license. |
| 5 | + */ |
| 6 | +#include <postgres.h> |
| 7 | +#include <utils/datum.h> |
| 8 | +#include <utils/typcache.h> |
| 9 | + |
| 10 | +#include "batch_metadata_builder_firstlast.h" |
| 11 | + |
| 12 | +#include "compression.h" |
| 13 | + |
| 14 | +static void firstlast_update_row(void *builder_, TupleTableSlot *slot); |
| 15 | +static void firstlast_insert_to_compressed_row(void *builder_, RowCompressor *compressor); |
| 16 | +static void firstlast_reset(void *builder_, RowCompressor *compressor); |
| 17 | + |
| 18 | +BatchMetadataBuilder * |
| 19 | +batch_metadata_builder_firstlast_create(Oid type_oid, AttrNumber attnum, int first_attr_offset, |
| 20 | + int last_attr_offset) |
| 21 | +{ |
| 22 | + BatchMetadataBuilderFirstLast *builder = palloc(sizeof(*builder)); |
| 23 | + TypeCacheEntry *type = lookup_type_cache(type_oid, 0); |
| 24 | + |
| 25 | + *builder = (BatchMetadataBuilderFirstLast){ |
| 26 | + .functions = |
| 27 | + (BatchMetadataBuilder){ |
| 28 | + .update_row = firstlast_update_row, |
| 29 | + .insert_to_compressed_row = firstlast_insert_to_compressed_row, |
| 30 | + .reset = firstlast_reset, |
| 31 | + .builder_type = METADATA_BUILDER_FIRSTLAST, |
| 32 | + }, |
| 33 | + .type_oid = type_oid, |
| 34 | + .attnum = attnum, |
| 35 | + .empty = true, |
| 36 | + .type_by_val = type->typbyval, |
| 37 | + .type_len = type->typlen, |
| 38 | + .first_is_null = true, |
| 39 | + .last_is_null = true, |
| 40 | + .first_metadata_attr_offset = first_attr_offset, |
| 41 | + .last_metadata_attr_offset = last_attr_offset, |
| 42 | + }; |
| 43 | + |
| 44 | + return &builder->functions; |
| 45 | +} |
| 46 | + |
| 47 | +static void |
| 48 | +firstlast_update_row(void *builder_, TupleTableSlot *slot) |
| 49 | +{ |
| 50 | + BatchMetadataBuilderFirstLast *builder = (BatchMetadataBuilderFirstLast *) builder_; |
| 51 | + Assert(builder->functions.builder_type == METADATA_BUILDER_FIRSTLAST); |
| 52 | + |
| 53 | + bool is_null; |
| 54 | + Datum val = slot_getattr(slot, builder->attnum, &is_null); |
| 55 | + |
| 56 | + if (builder->empty) |
| 57 | + { |
| 58 | + if (is_null) |
| 59 | + { |
| 60 | + builder->first_is_null = true; |
| 61 | + builder->first = (Datum) 0; |
| 62 | + } |
| 63 | + else |
| 64 | + { |
| 65 | + builder->first_is_null = false; |
| 66 | + builder->first = datumCopy(val, builder->type_by_val, builder->type_len); |
| 67 | + } |
| 68 | + builder->empty = false; |
| 69 | + } |
| 70 | + |
| 71 | + /* Always update last to the current row */ |
| 72 | + if (!builder->last_is_null && !builder->type_by_val) |
| 73 | + { |
| 74 | + pfree(DatumGetPointer(builder->last)); |
| 75 | + } |
| 76 | + |
| 77 | + if (is_null) |
| 78 | + { |
| 79 | + builder->last_is_null = true; |
| 80 | + builder->last = (Datum) 0; |
| 81 | + } |
| 82 | + else |
| 83 | + { |
| 84 | + builder->last_is_null = false; |
| 85 | + builder->last = datumCopy(val, builder->type_by_val, builder->type_len); |
| 86 | + } |
| 87 | +} |
| 88 | + |
| 89 | +static void |
| 90 | +firstlast_reset(void *builder_, RowCompressor *compressor) |
| 91 | +{ |
| 92 | + BatchMetadataBuilderFirstLast *builder = (BatchMetadataBuilderFirstLast *) builder_; |
| 93 | + |
| 94 | + if (!builder->empty) |
| 95 | + { |
| 96 | + if (!builder->first_is_null && !builder->type_by_val) |
| 97 | + { |
| 98 | + pfree(DatumGetPointer(builder->first)); |
| 99 | + } |
| 100 | + if (!builder->last_is_null && !builder->type_by_val) |
| 101 | + { |
| 102 | + pfree(DatumGetPointer(builder->last)); |
| 103 | + } |
| 104 | + builder->first = (Datum) 0; |
| 105 | + builder->last = (Datum) 0; |
| 106 | + } |
| 107 | + builder->empty = true; |
| 108 | + builder->first_is_null = true; |
| 109 | + builder->last_is_null = true; |
| 110 | + |
| 111 | + compressor->compressed_is_null[builder->first_metadata_attr_offset] = true; |
| 112 | + compressor->compressed_is_null[builder->last_metadata_attr_offset] = true; |
| 113 | + compressor->compressed_values[builder->first_metadata_attr_offset] = (Datum) 0; |
| 114 | + compressor->compressed_values[builder->last_metadata_attr_offset] = (Datum) 0; |
| 115 | +} |
| 116 | + |
| 117 | +static void |
| 118 | +firstlast_insert_to_compressed_row(void *builder_, RowCompressor *compressor) |
| 119 | +{ |
| 120 | + BatchMetadataBuilderFirstLast *builder = (BatchMetadataBuilderFirstLast *) builder_; |
| 121 | + Assert(builder->first_metadata_attr_offset >= 0); |
| 122 | + Assert(builder->last_metadata_attr_offset >= 0); |
| 123 | + |
| 124 | + if (builder->empty) |
| 125 | + { |
| 126 | + compressor->compressed_is_null[builder->first_metadata_attr_offset] = true; |
| 127 | + compressor->compressed_is_null[builder->last_metadata_attr_offset] = true; |
| 128 | + return; |
| 129 | + } |
| 130 | + |
| 131 | + /* First value */ |
| 132 | + if (builder->first_is_null) |
| 133 | + { |
| 134 | + compressor->compressed_is_null[builder->first_metadata_attr_offset] = true; |
| 135 | + } |
| 136 | + else |
| 137 | + { |
| 138 | + Datum first = builder->first; |
| 139 | + if (builder->type_len == -1) |
| 140 | + { |
| 141 | + Datum unpacked = PointerGetDatum(PG_DETOAST_DATUM_PACKED(first)); |
| 142 | + if (first != unpacked) |
| 143 | + { |
| 144 | + pfree(DatumGetPointer(first)); |
| 145 | + } |
| 146 | + first = unpacked; |
| 147 | + builder->first = first; |
| 148 | + } |
| 149 | + compressor->compressed_is_null[builder->first_metadata_attr_offset] = false; |
| 150 | + compressor->compressed_values[builder->first_metadata_attr_offset] = first; |
| 151 | + } |
| 152 | + |
| 153 | + /* Last value */ |
| 154 | + if (builder->last_is_null) |
| 155 | + { |
| 156 | + compressor->compressed_is_null[builder->last_metadata_attr_offset] = true; |
| 157 | + } |
| 158 | + else |
| 159 | + { |
| 160 | + Datum last = builder->last; |
| 161 | + if (builder->type_len == -1) |
| 162 | + { |
| 163 | + Datum unpacked = PointerGetDatum(PG_DETOAST_DATUM_PACKED(last)); |
| 164 | + if (last != unpacked) |
| 165 | + { |
| 166 | + pfree(DatumGetPointer(last)); |
| 167 | + } |
| 168 | + last = unpacked; |
| 169 | + builder->last = last; |
| 170 | + } |
| 171 | + compressor->compressed_is_null[builder->last_metadata_attr_offset] = false; |
| 172 | + compressor->compressed_values[builder->last_metadata_attr_offset] = last; |
| 173 | + } |
| 174 | +} |
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