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◆ histogram_budget_clamps()
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static |
Definition at line 54 of file postgis/cunit/cu_tester.c.
55{
56 /* Zero or negative row counts disable histogram construction. */
57 CU_ASSERT_EQUAL(histogram_cell_budget(0.0, 2, 100), 0);
58 CU_ASSERT_EQUAL(histogram_cell_budget(-1.0, 4, 100), 0);
59
60 /* Degenerate dimensionality cannot allocate histogram space. */
61 CU_ASSERT_EQUAL(histogram_cell_budget(1000.0, 0, 100), 0);
62
63 /* Matches the classic pow(attstattarget, ndims) path. */
64 CU_ASSERT_EQUAL(histogram_cell_budget(1e6, 2, 100), 10000);
65 CU_ASSERT_EQUAL(histogram_cell_budget(1e6, 3, 50), 125000);
66
67 /* attstattarget^ndims exceeds ndims * 100000 and must be clamped. */
68 CU_ASSERT_EQUAL(histogram_cell_budget(1e6, 4, 50), 400000);
69
70 /* attstattarget<=0 is normalised to the smallest viable target. */
71 CU_ASSERT_EQUAL(histogram_cell_budget(1e6, 2, 0), 1);
72
73 /* Row clamp shrinks the grid for small relations. */
74 CU_ASSERT_EQUAL(histogram_cell_budget(1.0, 2, 100), 20);
75
76 /* Large tables now preserve the dimensional cap instead of overflowing. */
77 CU_ASSERT_EQUAL(histogram_cell_budget(1.5e8, 2, 100), 10000);
78
79 /* Regression for #5984: huge attstat targets stabilise instead of wrapping. */
80 CU_ASSERT_EQUAL(histogram_cell_budget(5e6, 2, 10000), 200000);
81
82 /* Trigger the INT_MAX guard once both other caps exceed it. */
84}
static int histogram_cell_budget(double total_rows, int ndims, int attstattarget)
Definition gserialized_estimate_support.h:107
References histogram_cell_budget().
Referenced by main().
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