mirror of https://github.com/postgres/postgres
Implement the width_bucket() function, per SQL2003. This commit only adds
a variant of the function for the 'numeric' datatype; it would be possible to add additional variants for other datatypes, but I haven't done so yet. This commit includes regression tests and minimal documentation; if we want developers to actually use this function in applications, we'll probably need to document what it does more fully.
This commit is contained in:
Neil Conway
parent
19a495caaa
commit
0079547bcb
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@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/errcodes.sgml,v 1.4 2004/05/14 18:04:02 neilc Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/errcodes.sgml,v 1.5 2004/05/14 21:42:27 neilc Exp $ -->
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<appendix id="errcodes-appendix">
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<title><productname>PostgreSQL</productname> Error Codes</title>
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@ -310,6 +310,11 @@
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<entry>INTERVAL FIELD OVERFLOW</entry>
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</row>
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<row>
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<entry><literal>2201G</literal></entry>
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<entry>INVALID ARGUMENT FOR WIDTH BUCKET FUNCTION</entry>
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</row>
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<row>
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<entry><literal>22018</literal></entry>
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<entry>INVALID CHARACTER VALUE FOR CAST</entry>
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@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.201 2004/05/10 22:44:42 tgl Exp $
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$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.202 2004/05/14 21:42:27 neilc Exp $
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PostgreSQL documentation
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-->
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@ -751,6 +751,16 @@ PostgreSQL documentation
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<entry><literal>42.43</literal></entry>
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</row>
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<row>
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<entry><literal><function>width_bucket</function>(<parameter>op</parameter> <type>numeric</type>, <parameter>b1</parameter> <type>numeric</type>, <parameter>b2</parameter> <type>numeric</type>, <parameter>count</parameter> <type>integer</type>)</literal></entry>
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<entry><type>integer</type></entry>
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<entry>return the bucket to which <parameter>operand</> would
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be assigned in an equidepth histogram with <parameter>count</>
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buckets, an upper bound of <parameter>b1</>, and a lower bound
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of <parameter>b2</></entry>
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<entry><literal>width_bucket(5.35, 0.024, 10.06, 5)</literal></entry>
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<entry><literal>3</literal></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.82 2004/05/10 22:44:43 tgl Exp $
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$PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.83 2004/05/14 21:42:27 neilc Exp $
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-->
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<sect1 id="xfunc">
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@ -56,7 +56,7 @@ $PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.82 2004/05/10 22:44:43 tgl Exp $
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</para>
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<para>
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It's easiest to define <acronym>SQL</acronym>
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It's easiest to define <acronym>SQL</acronym>
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functions, so we'll start by discussing those.
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Most of the concepts presented for <acronym>SQL</acronym> functions
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will carry over to the other types of functions.
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@ -64,12 +64,12 @@ $PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.82 2004/05/10 22:44:43 tgl Exp $
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<para>
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Throughout this chapter, it can be useful to look at the reference
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page of the <command>CREATE FUNCTION</command> command to
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understand the examples better.
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Some examples from this chapter
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can be found in <filename>funcs.sql</filename>
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and <filename>funcs.c</filename> in the <filename>src/tutorial</>
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directory in the <productname>PostgreSQL</productname> source distribution.
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page of the <xref linkend="sql-createfunction"> command to
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understand the examples better. Some examples from this chapter
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can be found in <filename>funcs.sql</filename> and
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<filename>funcs.c</filename> in the <filename>src/tutorial</>
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directory in the <productname>PostgreSQL</productname> source
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distribution.
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</para>
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</sect1>
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@ -14,7 +14,7 @@
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* Copyright (c) 1998-2003, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.73 2004/05/07 00:24:58 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.74 2004/05/14 21:42:28 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -252,6 +252,7 @@ static Numeric make_result(NumericVar *var);
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static void apply_typmod(NumericVar *var, int32 typmod);
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static int32 numericvar_to_int4(NumericVar *var);
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static bool numericvar_to_int8(NumericVar *var, int64 *result);
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static void int8_to_numericvar(int64 val, NumericVar *var);
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static double numeric_to_double_no_overflow(Numeric num);
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@ -285,6 +286,8 @@ static void sub_abs(NumericVar *var1, NumericVar *var2, NumericVar *result);
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static void round_var(NumericVar *var, int rscale);
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static void trunc_var(NumericVar *var, int rscale);
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static void strip_var(NumericVar *var);
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static void compute_bucket(Numeric operand, Numeric bound1, Numeric bound2,
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NumericVar *count_var, NumericVar *result_var);
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/* ----------------------------------------------------------------------
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@ -803,6 +806,125 @@ numeric_floor(PG_FUNCTION_ARGS)
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PG_RETURN_NUMERIC(res);
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}
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/*
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* width_bucket_numeric() -
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*
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* 'bound1' and 'bound2' are the lower and upper bounds of the
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* histogram's range, respectively. 'count' is the number of buckets
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* in the histogram. width_bucket() returns an integer indicating the
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* bucket number that 'operand' belongs in for an equiwidth histogram
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* with the specified characteristics. An operand smaller than the
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* lower bound is assigned to bucket 0. An operand greater than the
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* upper bound is assigned to an additional bucket (with number
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* count+1).
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*/
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Datum
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width_bucket_numeric(PG_FUNCTION_ARGS)
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{
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Numeric operand = PG_GETARG_NUMERIC(0);
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Numeric bound1 = PG_GETARG_NUMERIC(1);
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Numeric bound2 = PG_GETARG_NUMERIC(2);
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int32 count = PG_GETARG_INT32(3);
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NumericVar count_var;
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NumericVar result_var;
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int32 result;
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if (count <= 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_ARGUMENT_FOR_WIDTH_BUCKET_FUNCTION),
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errmsg("count must be greater than zero")));
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init_var(&result_var);
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init_var(&count_var);
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/* Convert 'count' to a numeric, for ease of use later */
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int8_to_numericvar((int64) count, &count_var);
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switch (cmp_numerics(bound1, bound2))
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{
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case 0:
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_ARGUMENT_FOR_WIDTH_BUCKET_FUNCTION),
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errmsg("lower bound cannot equal upper bound")));
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/* bound1 < bound2 */
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case -1:
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if (cmp_numerics(operand, bound1) < 0)
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set_var_from_var(&const_zero, &result_var);
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else if (cmp_numerics(operand, bound2) >= 0)
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add_var(&count_var, &const_one, &result_var);
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else
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compute_bucket(operand, bound1, bound2,
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&count_var, &result_var);
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break;
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/* bound1 > bound2 */
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case 1:
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if (cmp_numerics(operand, bound1) > 0)
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set_var_from_var(&const_zero, &result_var);
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else if (cmp_numerics(operand, bound2) <= 0)
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add_var(&count_var, &const_one, &result_var);
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else
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compute_bucket(operand, bound1, bound2,
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&count_var, &result_var);
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break;
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}
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result = numericvar_to_int4(&result_var);
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free_var(&count_var);
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free_var(&result_var);
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PG_RETURN_INT32(result);
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}
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/*
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* compute_bucket() -
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*
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* If 'operand' is not outside the bucket range, determine the correct
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* bucket for it to go. The calculations performed by this function
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* are derived directly from the SQL2003 spec.
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*/
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static void
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compute_bucket(Numeric operand, Numeric bound1, Numeric bound2,
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NumericVar *count_var, NumericVar *result_var)
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{
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NumericVar bound1_var;
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NumericVar bound2_var;
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NumericVar operand_var;
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init_var(&bound1_var);
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init_var(&bound2_var);
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init_var(&operand_var);
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set_var_from_num(bound1, &bound1_var);
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set_var_from_num(bound2, &bound2_var);
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set_var_from_num(operand, &operand_var);
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if (cmp_var(&bound1_var, &bound2_var) < 0)
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{
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sub_var(&operand_var, &bound1_var, &operand_var);
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sub_var(&bound2_var, &bound1_var, &bound2_var);
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div_var(&operand_var, &bound2_var, result_var,
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select_div_scale(&operand_var, &bound2_var));
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}
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else
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{
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sub_var(&bound1_var, &operand_var, &operand_var);
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sub_var(&bound1_var, &bound2_var, &bound1_var);
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div_var(&operand_var, &bound1_var, result_var,
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select_div_scale(&operand_var, &bound1_var));
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}
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mul_var(result_var, count_var, result_var,
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result_var->dscale + count_var->dscale);
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add_var(result_var, &const_one, result_var);
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floor_var(result_var, result_var);
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free_var(&bound1_var);
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free_var(&bound2_var);
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free_var(&operand_var);
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}
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/* ----------------------------------------------------------------------
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*
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@ -1612,7 +1734,6 @@ numeric_int4(PG_FUNCTION_ARGS)
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{
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Numeric num = PG_GETARG_NUMERIC(0);
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NumericVar x;
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int64 val;
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int32 result;
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/* XXX would it be better to return NULL? */
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@ -1621,17 +1742,30 @@ numeric_int4(PG_FUNCTION_ARGS)
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot convert NaN to integer")));
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/* Convert to variable format and thence to int8 */
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/* Convert to variable format, then convert to int4 */
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init_var(&x);
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set_var_from_num(num, &x);
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result = numericvar_to_int4(&x);
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free_var(&x);
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PG_RETURN_INT32(result);
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}
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if (!numericvar_to_int8(&x, &val))
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/*
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* Given a NumericVar, convert it to an int32. If the NumericVar
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* exceeds the range of an int32, raise the appropriate error via
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* ereport(). The input NumericVar is *not* free'd.
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*/
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static int32
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numericvar_to_int4(NumericVar *var)
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{
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int32 result;
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int64 val;
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if (!numericvar_to_int8(var, &val))
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ereport(ERROR,
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(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
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errmsg("integer out of range")));
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free_var(&x);
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/* Down-convert to int4 */
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result = (int32) val;
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@ -1641,10 +1775,9 @@ numeric_int4(PG_FUNCTION_ARGS)
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(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
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errmsg("integer out of range")));
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PG_RETURN_INT32(result);
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return result;
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}
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Datum
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int8_numeric(PG_FUNCTION_ARGS)
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{
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@ -37,7 +37,7 @@
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.229 2004/05/10 22:44:49 tgl Exp $
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* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.230 2004/05/14 21:42:28 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -53,6 +53,6 @@
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*/
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/* yyyymmddN */
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#define CATALOG_VERSION_NO 200405101
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#define CATALOG_VERSION_NO 200405141
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#endif
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.328 2004/05/07 16:57:16 tgl Exp $
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* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.329 2004/05/14 21:42:28 neilc Exp $
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*
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* NOTES
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* The script catalog/genbki.sh reads this file and generates .bki
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@ -2508,6 +2508,8 @@ DATA(insert OID = 1745 ( float4 PGNSP PGUID 12 f f t f i 1 700 "1700" _null_
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DESCR("(internal)");
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DATA(insert OID = 1746 ( float8 PGNSP PGUID 12 f f t f i 1 701 "1700" _null_ numeric_float8 - _null_ ));
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DESCR("(internal)");
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DATA(insert OID = 2170 ( width_bucket PGNSP PGUID 12 f f t f i 4 23 "1700 1700 1700 23" _null_ width_bucket_numeric - _null_ ));
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DESCR("bucket number of operand in equidepth histogram");
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DATA(insert OID = 1747 ( time_pl_interval PGNSP PGUID 12 f f t f i 2 1083 "1083 1186" _null_ time_pl_interval - _null_ ));
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DESCR("plus");
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.237 2004/05/05 04:48:47 tgl Exp $
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* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.238 2004/05/14 21:42:30 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -758,6 +758,7 @@ extern Datum int8_sum(PG_FUNCTION_ARGS);
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extern Datum int2_avg_accum(PG_FUNCTION_ARGS);
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extern Datum int4_avg_accum(PG_FUNCTION_ARGS);
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extern Datum int8_avg(PG_FUNCTION_ARGS);
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extern Datum width_bucket_numeric(PG_FUNCTION_ARGS);
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/* ri_triggers.c */
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extern Datum RI_FKey_check_ins(PG_FUNCTION_ARGS);
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|
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@ -11,7 +11,7 @@
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*
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* Copyright (c) 2003, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.9 2004/05/14 18:04:02 neilc Exp $
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* $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.10 2004/05/14 21:42:30 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -116,6 +116,7 @@
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#define ERRCODE_ESCAPE_CHARACTER_CONFLICT MAKE_SQLSTATE('2','2', '0','0','B')
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#define ERRCODE_INDICATOR_OVERFLOW MAKE_SQLSTATE('2','2', '0','2','2')
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#define ERRCODE_INTERVAL_FIELD_OVERFLOW MAKE_SQLSTATE('2','2', '0','1','5')
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#define ERRCODE_INVALID_ARGUMENT_FOR_WIDTH_BUCKET_FUNCTION MAKE_SQLSTATE('2','2', '0', '1', 'G')
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#define ERRCODE_INVALID_CHARACTER_VALUE_FOR_CAST MAKE_SQLSTATE('2','2', '0','1','8')
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#define ERRCODE_INVALID_DATETIME_FORMAT MAKE_SQLSTATE('2','2', '0','0','7')
|
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#define ERRCODE_INVALID_ESCAPE_CHARACTER MAKE_SQLSTATE('2','2', '0','1','9')
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|
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@ -730,6 +730,57 @@ SELECT a, ceil(a), ceiling(a), floor(a), round(a) FROM ceil_floor_round;
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(7 rows)
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DROP TABLE ceil_floor_round;
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-- Testing for width_bucket()
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-- NULL result
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SELECT width_bucket(NULL, NULL, NULL, NULL);
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width_bucket
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--------------
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(1 row)
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-- errors
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SELECT width_bucket(5.0, 3.0, 4.0, 0);
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ERROR: count must be greater than zero
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SELECT width_bucket(5.0, 3.0, 4.0, -5);
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ERROR: count must be greater than zero
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SELECT width_bucket(3.0, 3.0, 3.0, 888);
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ERROR: lower bound cannot equal upper bound
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-- normal operation
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CREATE TABLE width_bucket_test (operand numeric);
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COPY width_bucket_test FROM stdin;
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SELECT
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operand,
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width_bucket(operand, 0, 10, 5) AS wb_1,
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width_bucket(operand, 10, 0, 5) AS wb_2,
|
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width_bucket(operand, 2, 8, 4) AS wb_3,
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width_bucket(operand, 5.0, 5.5, 20) AS wb_4,
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width_bucket(operand, -25, 25, 10) AS wb_5
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FROM width_bucket_test;
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operand | wb_1 | wb_2 | wb_3 | wb_4 | wb_5
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------------------+------+------+------+------+------
|
||||
-5.2 | 0 | 6 | 0 | 0 | 4
|
||||
-0.0000000000001 | 0 | 6 | 0 | 0 | 5
|
||||
0.0000000000001 | 1 | 5 | 0 | 0 | 6
|
||||
1 | 1 | 5 | 0 | 0 | 6
|
||||
1.99999999999999 | 1 | 5 | 0 | 0 | 6
|
||||
2 | 2 | 5 | 1 | 0 | 6
|
||||
2.00000000000001 | 2 | 4 | 1 | 0 | 6
|
||||
3 | 2 | 4 | 1 | 0 | 6
|
||||
4 | 3 | 4 | 2 | 0 | 6
|
||||
4.5 | 3 | 3 | 2 | 0 | 6
|
||||
5 | 3 | 3 | 3 | 1 | 7
|
||||
5.5 | 3 | 3 | 3 | 21 | 7
|
||||
6 | 4 | 3 | 3 | 21 | 7
|
||||
7 | 4 | 2 | 4 | 21 | 7
|
||||
8 | 5 | 2 | 5 | 21 | 7
|
||||
9 | 5 | 1 | 5 | 21 | 7
|
||||
9.99999999999999 | 5 | 1 | 5 | 21 | 7
|
||||
10 | 6 | 1 | 5 | 21 | 8
|
||||
10.0000000000001 | 6 | 0 | 5 | 21 | 8
|
||||
NaN | 6 | 0 | 5 | 21 | 11
|
||||
(20 rows)
|
||||
|
||||
DROP TABLE width_bucket_test;
|
||||
-- TO_CHAR()
|
||||
--
|
||||
SELECT '' AS to_char_1, to_char(val, '9G999G999G999G999G999')
|
||||
|
|
|
|||
|
|
@ -667,6 +667,52 @@ INSERT INTO ceil_floor_round VALUES ('-0.000001');
|
|||
SELECT a, ceil(a), ceiling(a), floor(a), round(a) FROM ceil_floor_round;
|
||||
DROP TABLE ceil_floor_round;
|
||||
|
||||
-- Testing for width_bucket()
|
||||
-- NULL result
|
||||
SELECT width_bucket(NULL, NULL, NULL, NULL);
|
||||
|
||||
-- errors
|
||||
SELECT width_bucket(5.0, 3.0, 4.0, 0);
|
||||
SELECT width_bucket(5.0, 3.0, 4.0, -5);
|
||||
SELECT width_bucket(3.0, 3.0, 3.0, 888);
|
||||
|
||||
-- normal operation
|
||||
CREATE TABLE width_bucket_test (operand numeric);
|
||||
|
||||
COPY width_bucket_test FROM stdin;
|
||||
-5.2
|
||||
-0.0000000000001
|
||||
0.0000000000001
|
||||
1
|
||||
1.99999999999999
|
||||
2
|
||||
2.00000000000001
|
||||
3
|
||||
4
|
||||
4.5
|
||||
5
|
||||
5.5
|
||||
6
|
||||
7
|
||||
8
|
||||
9
|
||||
9.99999999999999
|
||||
10
|
||||
10.0000000000001
|
||||
NaN
|
||||
\.
|
||||
|
||||
SELECT
|
||||
operand,
|
||||
width_bucket(operand, 0, 10, 5) AS wb_1,
|
||||
width_bucket(operand, 10, 0, 5) AS wb_2,
|
||||
width_bucket(operand, 2, 8, 4) AS wb_3,
|
||||
width_bucket(operand, 5.0, 5.5, 20) AS wb_4,
|
||||
width_bucket(operand, -25, 25, 10) AS wb_5
|
||||
FROM width_bucket_test;
|
||||
|
||||
DROP TABLE width_bucket_test;
|
||||
|
||||
-- TO_CHAR()
|
||||
--
|
||||
SELECT '' AS to_char_1, to_char(val, '9G999G999G999G999G999')
|
||||
|
|
|
|||
Loading…
Reference in New Issue